Xương phát triển được bề ngang là do:

A. Tủy xương

B. Lớp màng xương

C. Mô xương chắc

D. Khoang xương

Hai dao động điều hòa có đồ thị li độ - thời gian như hình vẽ. Tổng vận tốc tức thời của hai dao động có giá trị lớn nhất là

A. 48π cm/s.

B. 2π cm/s.

C. 14π cm/s.

D. 100π cm/s.

OLM thay trang bìa là năm mới đi cho vui

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

Jack has won a jackpot prize. 10% of it was donated to flooded areas.

A. Jack has won a jackpot prize, 10% which half was donated to flooded areas.

B. Jack has won a jackpot prize, 10% of which was donated to flooded areas.

C. Jack has won a jackpot prize, 10% of that was donated to flooded areas.

D. Jack has won a jackpot prize, which was donated to flooded areas.