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【简答题】在正反转控制电路中，正反转接触器为什么要进行互锁控制，互锁控制的方法有哪些?
【单选题】--When is National Day? --It's on _____ the first.
A.
November
B.
June
C.
October
D.
December
【单选题】When is the national day of the USA?
A.
4th of August
B.
4th of July
C.
10th of November
D.
3th of July
【简答题】控制的方法有哪些？
【单选题】When is the national day of France?
A.
January 1 st
B.
December 25 th
C.
October 10 th
D.
July 14 th
【单选题】---When is National Day? ---It's ______.
A.
April 1st
B.
May 1st
C.
June 1st
D.
October 1st
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