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【多选题】
继电器控制电路常用的分析方法有( )。A.
经验分析法
B.
直接分析法
C.
逻辑分析法
D.
状态动作示意图法
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【简答题】aware of/conscious of how the infection happens 翻译
【单选题】If something seldom happens, it
A.
happens every day
B.
does not happen often
C.
happens on purpose
【简答题】You see the lightning _________ it happens, but you hear the thunder later. A) the instant B) for an instant C) on the instant D) in an instant
【单选题】______________ the day before yesterday. [ ]
A.
something happens to him
B.
He happens to something
C.
Something happened to him
【单选题】If anything the machine, please let us know.
A.
happens on
B.
happens to
C.
happened on
D.
will happen to
【单选题】If anything __________the machine, please let us know. [ ]
A.
happens on
B.
happens to
C.
happened on
D.
happen to
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