如图是某女生在转动粗准焦螺旋使镜筒下降的动作,图中正确的是( )
A:
B:
C:
D:
It's ________ late now, but I have homework to do.
解:设快车开出x小时后两车相遇,根据题意得:
竹节虫体表坚韧,有三对足,足和身体分节,属于( )