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【简答题】
举例说明哪些常见的设备可以作为PLC的输入设备和输出设备
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举一反三
【简答题】Millions of people are moving away from rural areas in other countries. In other words, in much of the world there is an exodus from the countryside to the cities.
【单选题】Among the four words from paragraph 5, which doesn' t fall into the same category as the other three?
A.
Circus.
B.
Enthusiast.
C.
Costume.
D.
Clown.
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