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【单选题】
数控机床进给系统的机械传动结构中,具有滚动摩擦的导轨是( )A.
静压导轨
B.
滚动导轨
C.
塑料导轨
D.
气动导轨
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举一反三
【单选题】You’d better sit in ______ front of the bus so you can have ______ better view on the way.
A.
the; 不填
B.
不填; the
C.
the; a
D.
不填; a
【多选题】TCP/IP 的体系结构中互联层的功能有____
A.
处理来自传输层的分组发送请求
B.
负责通过网络发送和接受IP数据报
C.
负责应用进程之间的端到端通信
D.
处理接收的数据报
【单选题】You'd ______ watch TV any more. [ ]
A.
better not to
B.
don't better
C.
better not
D.
not better
【单选题】You’d better practice more and play better if you want to make a good ______ on the audience at the concerts.
A.
decision
B.
impression
C.
harmony
D.
conclusion
【单选题】You'd _______ go there alone in such a cold day. [ ]
A.
better not
B.
better don't
C.
not better
D.
better not to
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