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【多选题】
下列属于PLC特点的是（ ）。A.
可靠性高，抗干扰能力强
B.
功能完善，通用性好
C.
编程简单、使用方便
D.
设计、安装、调试和维修工作量大
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【简答题】B It was the week before Christmas, and the line at the post office snaked twice around the lobby( 大厅 ). It seemed that no one was moving. The office looked like an exhibit in the Postal Wax Museum. I...
【单选题】The machine hasn’t been in use for a long time. I wonder whether it is in good _____.
A.
surrounding
B.
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C.
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habit
【单选题】The machine hasn’t been in use for a long time. I wouder whether it is in good ______. A. surrounding B. condition C. environment D. habit
A.
surrounding
B.
condition
C.
environment
D.
habit
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【单选题】The machine hasn’t been in use for as long time. I wonder whether it is in good .
A.
surrounding
B.
condition
C.
environment
D.
habit
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