槽轮机构的主动件在工作中是作是( )运动。
A. 往复摆动
B. 直线往复
C. 等速旋转
D. 加速旋转
棘轮机构的主动件,是作( )运动的。
A. 往复摆动
B. 直线往复
C. 等速旋转
D. 加速旋转运动
Further information can be from the nearest British Council office.
A. obtained
B. found
C. got
D. taken
Good theories are important of course, but we must have evidence to support them.
A. empirical
B. true
C. realistic
D. real