数控机床上的阅读机有光电式、气动式和（）三种。
A、机械式
B、液压式
C、手工操作
D、混合式
参考答案：A
________cleaning the yard and making up the beds for the old, we also read newspapers for them
and had chats with them. [ ]
A. Except for
B. Rather than
C. Apart from
D. Instead of
我国历史上第一部兵书是以下哪部？（）
A.《孙膑兵法》
B.《孙子兵法》
C.《太公兵法》
D.《三十六计》
