罗茨风机齿轮箱内是（）齿轮。
A.增速
B.减速
C.同步
D.变速
参考答案：C
Last Sunday, I went shopping for the perfect dress, _________would make me look younger.
A．one in which
B．the one in which
C．one that
D．the one that
花类药材一般采收应在( )
A．秋、冬季B．春末夏初C．开花前或果实未成熟时D．花含苞待放时E．全年均可
