Có mấy ứng dụng công nghệ cao trong sản xuất giá thể trồng cây được giới thiệu?

PHẦN II. Thí sinh trả lời từ câu 1 đến câu 4. Trong mỗi ý a), b), c), d) ở mỗi câu, thí sinh chọn đúng hoặc sai.

Cho phương trình lượng giác \(3 - \sqrt 3 \tan \left( {2x - \frac{\pi }{3}} \right) = 0\).

a) Phương trình đã cho tương đương với phương trình \(\tan \left( {2x - \frac{\pi }{3}} \right) = \sqrt 3 \).

b) Phương trình đã cho có nghiệm \(x = \frac{\pi }{6} + \frac{{k\pi }}{2},k \in \mathbb{Z}\).

c) Phương trình đã cho có nghiệm âm lớn nhất bằng \( - \frac{\pi }{3}.\)

d) Khi \(\frac{{ - \pi }}{4} < x < \frac{{2\pi }}{3}\) thì phương trình đã cho có ba nghiệm.

Một đoạn dây dẫn thẳng dài 128 cm được đặt trong một từ trường đều có cảm ứng từ 0,83 T. Cho dòng điện có cường độ 18 A chạy qua đoạn dây dẫn. Độ lớn lực từ cực đại tác dụng lên đoạn dây là 

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

    Fashion in the 1960s reflected the cultural and political upheaval of the time. The hippie and counterculture movement gave rise to accessories like Pocahontas-style headbands and medallions worn around the neck. Hippies wore long, loosely fitting clothing, often in natural fabrics. Hemlines rose as Mary Quant popularized the miniskirt and hot pants in her lines for JC Penney. And mod fashion, with brightly colored space-age geometric patterns, shift dresses and colored tights became the mainstream. Both miniskirts and mod-shift dresses were worn with knee-high go-go boots.

    [I] During the 1970s, the loose-fitting hippie clothes of the prior decade gave way to exotic fabrics and bell-bottom jeans for men and women. Hemlines continued to rise and hot pants continued their popularity, reflecting the flashy style of the decade. However, the 1970s also saw the popularity of a longer hemline, from mid-calf to ankle-length. [II] Women wore peasant-style clothing, especially blouses with off-the-shoulder necklines and lace trim, with their jeans or skirts. [III] Disco fashion emerged, featuring bright patterns and tightly fitting clothing meant to show off the body. Platform shoes elevated their wearer, male or female, anywhere from two to four inches or more. [IV]

    The 1980s saw another fashion upheaval. Angst-ridden punks wore Dr. Marten and steel-toed army boots, chains, tartan patterns, and bondage pants. Punks focused more on their hair during this period, dying, teasing and chopping their hair into asymmetric styles that seemed to defy gravity. Women–and men–experimented with heavy eyeliner in a variety of colors. Women wore neon colors, jelly shoes, tight jeans, leggings, leg warmers and oversized sweatshirts. Menswear-inspired looks also became popular for both sexes. Men wore ‘power suits,’ named so for their price, which made these suits a reflection of the wealth of the wearer. Women’s jackets featured big shoulder pads that made the shoulders appear higher and larger, similar to the male silhouette.   

    1990’s fashion was far more subdued than the garish, wild styles of the 1980s. Bands like Nirvana influenced the grunge look, which featured rock-concert tee shirts under plaid flannel shirts, jeans and long, greasy hair. Overalls were worn by both sexes, either with one or both shoulder straps unhooked. The punk style of the 1870s and 1980s evolved into the goth fashion trend, which featured black clothing, black boots and studded bracelets in the style of bands like Nine Inch Nails and Marilyn Manson.

Which of the following is best supported by the author of the passage?

Cho đoạn mã lệnh CSS:

Đoạn mã lệnh HTML nào sau đây sẽ áp dụng định dạng được khai báo?

Cáp mạng truyền tín hiệu bằng ánh sáng được gọi là gì?