A:西部低、东部高
B:中部高、四周低
C:中部低、四周高
D:西部高、东部低
小华体检时站在磅秤上,秤的示数是50kg,这时秤受到人对它的压力大小是____ N,当小华抬起一只脚后,他对秤的压力大小____ ,压强大小____ (最后两空选填变大/变小/不变)。
英译汉
香港和澳门回归的时间分别是( )
—— Datou Ge Hongyu made few mistakes in the competition of singing, ________ ?—— _____________. I think his perform was the most wonderful in The Voice of China.
已知f(cosx)=cos5x,则f(sinx)=____.