如图所示,两个质量不同的小球用长度不等的细线拴在同一点,并在同一水平面内作匀速圆周运动,则它们的( )
A:运动周期不相同
B:运动线速度不一样
C:运动角速度不相同
D:转动频率不同
血浆成分中含量最多的是
⑴____ A. vacation B. exam C. David D. favorite
⑵____ A. most B. post C. host D. cost
⑶____ A. seem B. feel C. coffee D. between
⑷____ A. however B. blow C. brown D. now
⑸____ A. clearly B. hear C. learn D. near
—What club do you want to join, Han Mei?
— .