只有()才能利用机械能来完成有用功或转换机构能。
A.机构;
B.机器;
C.构件;
D.零件。
参考答案:B
When he was there, he ________ go to that coffee shop at the corner after work every day.
A.would
B.should
C.had better
D.might
每一批啤酒在包装前,都要通过严格的()和()合格后才能灌装。