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【单选题】
S7-200的CPU22X系列PLC有( )个定时器。A.
32
B.
64
C.
128
D.
256
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【简答题】任务型阅读。 Mrs. Wilson is not tall with curly hair. She comes from Australia. She is our math teacher. But I don’t like math. It’s too di fficult and boring. Mrs. Wilson is 25 years old. She is very shy （...
【简答题】有四个渐开线标准直齿圆柱齿轮,已知:齿轮 1 为 m 1 =2.5 , z 1 =40 ;齿轮 2 为 m 2 =3 , z 2 =40 ;齿轮 3 为 m 3 =2.5 , z 3 =60 ;齿轮 4 为 m 4 =4 , z 4 =25 。经分析可知:( 1 )齿轮 和齿 轮 可以正确啮合;( 2 )齿轮 和齿轮 渐开线形状相同。(注:用齿轮序号回答)
【简答题】Linda Wilson works in the Administration Department at Fine Cloth. David emails her to ask for her help. Refer to the emails in the practical reading part, and write the appropriate words or phrases f...
【简答题】任务型阅读 Mrs. Wilson is not tall with curly hair. She comes from Australia. She is our math teacher. But I don’t like math. It’s too difficult and boring. Mrs. Wilson is 25 years old. She is very shy （害羞...
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