Căn cứ theo đối tượng hàng hoá, dịch vụ được trao đổi, mua bán thị trường được chia làm mấy loại chính?

Cho một khinh khí cầu nằm trên mặt đất, gồm khoang chứa hàng nặng $M=400 kg$ và phần khí cầu hình cầu chứa $V=4000 m^3$ không khí. Trên khí cầu có một lỗ thông hơi nên áp suất không khí bên trong khí cầu luôn bằng với áp suất khí quyển. Coi thể tích phần khí cầu luôn không đổi và không khí là khí lý tưởng, có khối lượng mol $\mu =29 g/mol$. Biết ở sát mặt đất, áp suất khí quyển là ${\rho }_0=1,03.{10}^5 Pa$, khối lượng riêng của không khí là ${\rho }_0=1,23 kg/m^3$ , gia tốc trọng trường có giá trị $g=9,8 m/s^2$ . Bỏ qua khối lượng của vỏ khí cầu và thể tích của khoang hàng.

     a) Phương trình trạng thái của khí lí tưởng được viết dưới dạng là $\rho V=nRT$.

     b) Nhiệt độ của không khí ở sát mặt đất là $T_0=292 K$.

     c) Trọng lượng của khinh khí cầu là $P=39102 N$.

d) Để khinh khí cầu có thể rời khỏi mặt đất thì nhiệt độ phần không khí trong khí cầu nhỏ nhất là $30°C$.

Read the following passage about wildlife conservation and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

[I] Wildlife conservation refers to the efforts made to protect and preserve wild animal species and their habitats. [II] It is crucial for maintaining biodiversity, which plays a vital role in ecosystem stability and health (Smith & Jones, 2018). [III] Unfortunately, many species are threatened due to habitat destruction, poaching, and climate change, making conservation efforts more urgent than ever. [IV]

One of the primary reasons for wildlife conservation is the preservation of biodiversity. A diverse range of species contributes to ecosystem services, such as pollination, water purification, and climate regulation. The loss of a single species can disrupt these services and lead to ecological imbalances. For instance, the decline of pollinators like bees has serious implications for food production and agriculture (Global Biodiversity Outlook, 2020).

Moreover, wildlife conservation has significant economic benefits. Many communities depend on ecotourism, which relies on healthy wildlife populations and intact ecosystems. According to a study by the World Wildlife Fund (WWF), ecotourism can generate billions of dollars in revenue, providing jobs and supporting local economies (WWF, 2021). Protecting wildlife not only safeguards natural resources but also creates sustainable livelihoods for local populations.

However, effective wildlife conservation requires a collaborative approach. Governments, non-governmental organizations, and local communities must work together to implement policies and strategies that promote conservation efforts. Community-based conservation initiatives, where local people actively participate in protecting their natural resources, have shown promising results. These initiatives empower communities and ensure that conservation efforts are tailored to local needs and contexts (Bennett & Dearden, 2014).

Which of the following can be inferred from the passage?

Trong không gian với hệ tọa độ $Oxyz$, cho hình chóp $S.ABCD$ có các đỉnh lần lượt là

$S(0;0;a)$; $A(0; 0; 0)$; $B(2a; 0; 0)$; $D\Big(0; \dfrac{2a\sqrt{3}}{3}; 0 \Big)$ với $a>0$.

Góc giữa hai mặt phẳng $(SBD)$ và $(ABCD)$ bằng

Các lĩnh vực trao đổi, mua bán mà ở đó các chủ thể kinh tế tác động qua lại lẫn nhau để xác định giá cả và số lượng hàng hoá, dịch vụ được gọi là gì?

Read the following passage about education in Nepal and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

An education pioneer born into rural poverty in Nepal has opened 30 schools in a bid to boost prospects for his country's children.

The World Bank ranks Nepal as the globe's 31st poorest country, with almost 10 million people living on daily incomes between £1.48 and £2.50. Many rural villages remain unreached by government schooling and adult literacy stood at just 60 per cent in 2011.

Surya Karki and his charity United World Schools Nepal (UWS) are tackling high illiteracy and poverty rates by funding and improving education.

The first school opened in 2015 – since then 92 per cent of children have completed primary education, which finishes at age eight, and continued into secondary education with UWS schools. In comparison to 39 per cent of students continuing education who attended government schools.

Mr Karki was born into poverty in rural Nepal. Speaking to the Telegraph he said: “School is the only solution to the poverty cycle that we live in. I was raised by a single mother in a male-dominated society.

“The school that I went to was approximately two hours walk away. My house was on top of a hill and my mother had to drag me across rivers. We used to walk 10 miles a day. The schooling was really bad.”

Of the students who would go to school, he said: “They would end up in the same place, as cheap migrant workers in Qatar, Saudi, or Dubai. There was no value in education – no success stories.”

[A] Karki’s mother was a firm believer in education, and at age eight Karki secured a scholarship to study in the capital, Kathmandu. [B] From there he won scholarships and completed Masters degrees in China and the United States. [C] Karki said. “Inequalities in a country can only be decreased if there is access to knowledge.” [D]

The devastating earthquake in 2015 damaged 9,300 schools, displacing hundreds of thousands of families and pushing 700,000 people into poverty. As of January 2018, only 2,891 schools had been rebuilt. Karki said: “We came at a crucial time, where we could redo or undo what had been done badly. Education was really bad in terms of infrastructure, quality of teachers, training. It was an opportunity for us to really make things better.”

UWS Nepal has so far built 30 schools and has seven more in construction. The schools run between 10 am and 3:30 pm, and have an 86 per cent average attendance rate, which Karki says is almost double the attendance rates for government schools in the vicinity. Sexual health classes are taught to the children in the later years.

The word “undo” in the passage mostly means ______.

Đâu là cơ sở quan trọng để hình thành các tổ chức liên kết khu vực?

Giá của một số loại túi xách (đơn vị nghìn đồng) được cho như sau:

Tìm số trung vị của mẫu số liệu sau:

Các chính sách, biện pháp cải cách trong nông nghiệp của Trung Quốc không phải là điều gì?

Read the passage carefully

1. Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

2. The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

3. On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't  agree.

4. What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

5. As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

Choose an option (A, B, C, or D) that best answers each question:

According to the passage, what can be inferred about cellphones?

Định luật vạn vật hấp dẫn của Newton được cho bởi công thức $F=G\dfrac{m_1.m_2}{r^2}$. Trong đó $F$ là lực hấp dẫn giữa hai vật thể bất kì, $G$ là hằng số hấp dẫn, $m_1,\,m_2$ là khối lượng các vật, $r$ là khoảng cách giữa chúng. Đồ thị của hàm số cho bởi công thức này có tiệm cận đứng là $r=0$, điều này có nghĩa là khi $r$ dần về $0$ thì lực hấp dẫn sẽ tiến đến

Nguyên nhân khách quan nào dẫn đến sự thất bại của cuộc kháng chiến chống thực dân Pháp của nhân dân Việt Nam cuối thế kỉ XIX?

Cho hàm số \(f\left( x \right)=-{{x}^{3}}+m{{x}^{2}}-\left( {{m}^{2}}+m+1 \right)x\). Với \(m\) là tham số thực.

Gọi \(S\) là tập hợp các giá trị của tham số \(m\) sao cho giá trị nhỏ nhất của hàm số trên đoạn [-1;1] bằng -6. Tính tổng các phần tử của \(S\).

Một dây AB dài 100 cm có đầu B cố định. Tại đầu A thực hiện dao động điều hòa có tần số $f$ = 40 Hz. Vận tốc truyền sóng trên dây là $v$ = 20 m/s. Số điểm nút, số điểm bụng trên dây là

Tác giả nào KHÔNG trưởng thành trong cùng thời kì với các tác giả khác?