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【单选题】
根据下图符号,组合开关3、4接点,在( )档位闭合。A.
1
B.
2
C.
3
D.
4
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【单选题】Sometimes it's just hard to choose. You're in a restaurant, and the waiter has his pen at the ready. As you hesitate, he gradually begins to take a close interest in the ceiling, his fingernails, then...
A.
it is common for his customer to hesitate in ordering a meal
B.
it is impolite for his customer to order with hesitation
C.
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D.
it is possible to get know his customer's partner
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