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题型:问答题 简答题 Don’t be discouraged. ____ things as they are and you will enjoy every day of your life.A.TakingB.To take C.Take D.Taken 查看答案
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题型:问答题 简答题 西门子MM420变频器的主电路电源端子()需经交流接触器和保护用断路器与三相电源连接。但不宜采用主电路的通、断进行变频器的运行与停止操作。A、X、Y、ZB、A、B、CC、U、V、WD、L1、L2、L3 查看答案