Đối với dao động điều hòa, khoảng thời gian ngắn nhất sau đó trạng thái dao động lặp lại như cũ gọi là

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. 

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.

[A] 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. [B] Women wore peasant-style clothing, especially blouses with off-the-shoulder necklines and lace trim, with their jeans or skirts. [C] 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. [D]

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 does the passage mainly discuss?

Chọn ý đúng: Ở xứ lạnh, về mùa đông loại hình vận tải nào sau đây được cho không thể hoạt động được?

Phát triển đáp ứng được nhu cầu của hiện tại mà không làm tổn hại đến khả năng đáp ứng nhu cầu đó của các thế hệ tương lai gọi là gì?

Sử dụng thực phẩm trong trường hợp nào sau đây có thể dẫn đến tình trạng ngộ độc thực phẩm do nấm mốc?

Nhà thơ nào KHÔNG thuộc phong trào Thơ Mới giai đoạn 1932 – 1945?

Bước đầu tiên của quy trình sản xuất giá thể viên nén xơ dừa là:

Ví dụ nào dưới đây thể hiện khả năng tự điều chỉnh của các cấp độ tổ chức sống?

Một vật thực hiện đồng thời hai dao động điều hòa có phương trình dao động x₁ = A₁cos(ωt + φ₁) và x₂ = A₂cos(ωt + φ₂).Biên độ dao động tổng hợp là:

Phát biểu nào không đúng với ý nghĩa của phương pháp kí hiệu?

Phát biểu nào dưới đây về dao động tắt dần là sai?

Rewrite the following sentences without changing their meaning, using the given words. Write full sentence.

It's a pity I didn't go on holiday with my class last week.

I wish ___________________.