Việt Nam là thành viên của các tổ chức liên kết khu vực nào sau đây?

Năng lượng cần thiết để giải phóng một electron liên kết thành electron dẫn (năng lượng kích hoạt) của các chất PbS, Ge, Si, CdTe lần lượt là: 0,30eV; 0,66eV; 1,12eV; 1,51eV. Lấy 1eV = 1,6.10^-19J, khi chiếu bức xạ đơn sắc mà mỗi photon mang năng lượng 9,94.10^-20J vào các chất trên thì số chất mà hiện tượng quang điện trong xảy ra là 

Nhờ hiện tượng nhiễu xạ ánh sáng, người ta đã phát hiện ra rằng ánh sáng có tính chất sóng. Năm 1801, nhà vật lí người Anh Y- âng (Thomas Young) đã thực hiện thí nghiệm về giao thoa ánh sáng (thí nghiệm Y- âng) để khẳng định tính chất sóng của ánh sáng. Trong thí nghiệm Y- âng về giao thoa, chiếu ánh có bước sóng λ tới khe hẹp S, khi đó khe S nhiễu xạ ánh sáng qua nó và trở thành một nguồn sáng mới, nguồn này lại chiếu sáng hai khe S₁, S₂ giống nhau, đặt cách nhau một khoảng a và cách đều S. Khi đó trên màn quan sát được những vạch sáng và tối xen kẽ. Biết khoảng cách từ mặt phẳng chứa hai khe đến màn quan sát là D. Công thức tính khoảng cách giữa hai vân sáng liên tiếp (khoảng vân) là \(i=\frac{\lambda D}{a}\).

Điều chỉnh để tăng dần khoảng cách từ nguồn sáng đơn sắc S đến mặt phẳng chứa hai khe S₁, S₂ thì khoảng cách giữa hai vân sáng liên tiếp trên màn sẽ

Having denied the responsibility for the environmental it caused, the factory was forced to close down.

Xác định: Nội dung không đúng về điểm khác nhau giữa kĩ thuật chuyển gen dùng plasmit làm thể truyền và kĩ thuật chuyển gen dùng virut làm thể truyền là?

Read the following passage about How Failures Led to Breakthroughs 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 23 to 30.

Many important discoveries happened because of mistakes and unexpected accidents. Alexander Fleming found penicillin when he left his laboratory messy before going on holiday. After vacation, he saw mold growing on his experiment plate. Fleming noticed this mold killed bacteria around it very effectively. This fortunate accident later saved millions of lives around the world. Scientists call finding valuable things by chance "serendipity," which happens often in research.

The Post-it Note began as a mistake that seemed useless at first. In 1968, Spencer Silver tried making a strong glue for 3M company but created a weak one instead that didn't stick permanently. Nobody knew what to do with this disappointing result for several years. Then his colleague Arthur Fry realized this "failure" could make perfect bookmarks that wouldn't damage pages when removed. This weak adhesive eventually became one of the most popular office products worldwide, changing how people work.

In cooking, many favorite foods came from kitchen errors and quick substitutions. Ruth Wakefield invented chocolate chip cookies when she ran out of baker's chocolate and used broken pieces of semi-sweet chocolate instead. She thought they would melt completely in the dough, but they kept their shape during baking. Potato chips were created when chef George Crum made extremely thin potatoes to annoy a customer who repeatedly complained about thick fries. Surprisingly, the customer loved them and ordered more!

These fascinating stories teach us that mistakes can lead to new opportunities and unexpected innovations. Thomas Edison said about his many failed light bulb attempts, "I haven't failed. I've just found 10,000 ways that don't work." This positive attitude shows we should see errors as valuable learning chances. Smart people don't fear making mistakes in their work; they fear missing opportunities to learn from them and discover something amazing.

In which paragraph does the writer mention a failed attempt to create strong glue led to a useful product?

Toàn bộ các khoản thu, chi của Nhà nước được dự toán và thực hiện trong một khoảng thời gian nhất định được gọi là gì?

Cho hình chóp S. ABC có \(SA \bot \left( {ABC} \right)\), M là trung điểm của BC. Tam giác ABC cân tại A. Mệnh đề nào sau đây sai?

Nguyên tố Q có số hiệu nguyên tử bằng 14. Electron cuối cùng của nguyên tử nguyên tố Q điền vào lớp, phân lớp nào sau đây?

In Part Three of the Speaking Section you work together with a partner. You have to do a single task which usually lasts about 3 minutes. One possible task is “problem solving”, which means you have to look at some visual information and then discuss the problem with your partner. You may be shown photos, drawings, diagrams, maps, plans, advertisements or computer graphics and it  is essential that everyone (631)___________ them carefully. If necessary, check you know exactly (632) ________________ the examiner to repeat the (633) __________ or make them clearer.

While you are doing the task, the examiner will probably say very little and you should ask your partner questions and (634)  ___________ suggestions if he or she is not saying much. If either of you have any real difficulties, the examiner may decide to step in and help. Normally, however, you find plenty to say, which helps the assessor to give you a fair mark. (635) ____________in doing the task by competing with your partner, which includes taking turns in giving opinions and replying appropriately, although in the end it may be possible to “agree to disagree”.

Câu 634:

Phương thức kiếm sống của loài người từ thời nguyên thủy đến thời kì hình thành xã hội có giai cấp trải qua các bước tiến là:

Cáccấp độ tổ chức của thế giới sống là

Choose A, B, C or D that has the CLOSEST meaning to the given sentence in the question.

By the time they figured out the directions, they had already missed the conference.

Nội dung nào sau đây không nói về nhược điểm của cơ chế thị trường?

Find the mistake: After John eaten dinner, he wrote several letters and went to bed.

Tình trạng thất nghiệp xuất hiện có tính chu kì của nền kinh tế, khi nền kinh tế bị suy thoái hoặc khủng hoảng dẫn đến mức cầu chung về lao động giảm được gọi là gì?

Đâu là phương án đúng: Vị trí khung tên như thế nào so với khung bản vẽ?

Điện toán đám mây giúp khắc phục nhược điểm của loại mạng nào sau đây?

Mark the letter A, B, C, or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17

a. Mary: - Oh, thanks for letting me know! I’ll keep an eye on the road.

b. Peter: - Be careful when driving on Main Street. The roads are really slippery.

c. Peter: - Good idea! It’s always better to be safe, especially in bad weather.

Theo quy định của pháp luật, đối tượng chịu thuế ở nước ta là ai?

Read the following passage 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 23 to 30.

Vietnamese Women’s Achievements

Women have always played an important role in Vietnam’s history. Some fight for their country, some inspire others, and some make positive changes to society. Their contributions have shaped the nation in various ways, leaving a lasting impact on culture, politics, and the arts.

Trưng Trắc and Trưng Nhị are famous examples of women who fought for their country’s freedom. Known in Vietnamese as “Hai Bà Trưng,” the Trưng sisters successfully led their people in a rebellion against foreign invaders in 40 A.D. After their victory, they ruled the country for three years, demonstrating remarkable leadership and bravery. As the first female rulers of Vietnam, the Trưng sisters have become symbols of patriotism and resilience. Their significance is even greater considering that Vietnamese women at the time had very limited access to education and politics. Their story continues to inspire generations.

Sương Nguyệt Anh is another example of an influential Vietnamese woman. As the daughter of the patriotic poet Nguyễn Đình Chiểu, she mastered literature from a young age. She worked as a teacher before becoming the editor-in-chief of Nữ Giới Chung, the first women’s newspaper in Sài Gòn, in 1918. As the first female editor in Vietnam, she made significant contributions to the press, feminism, and poetry. Through her work, she promoted women’s rights and encouraged female empowerment.

A third example is Điềm Phùng Thị. She graduated from Hà Nội Medical University in 1946 and earned a PhD in dentistry in France in 1954. However, she later pursued a career in sculpture, creating artworks that reflected her love for Vietnam. She exhibited her work throughout Europe and became the first female Vietnamese member of the European Academy of Arts and Sciences in 1992. Her name was later recorded in the Larousse Dictionary of Painters, recognizing her as a remarkable artist.

According to the passage, which of the following statements is TRUE?