A. Brother and sister. B. Lawyer and client. C. Husband and wife. D. Boyfriend and girlfriend.
A. src B. border C. href D. scroll
A. height B. width C. border D. wide
A. 对 B. 错
A. 惯性力与压力 B. 惯性力与重力 C. 惯性力与表面张力 D. 惯性力与粘性力