题目内容
对于中载下降操作的方法是，降手柄推到下降第()档比较合适。
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在电路中如果发生短路或严重超载是，需要迅速切断电源，担负这一任务的叫()继电器
--_________？
--I'm from Mexico.
A：Where are you from
B：How do you come here
C：What's your name
D：How far is it
-Morning, sir.______
-I've learnt that silk is famous here. Can I get some？
A：Can you help me？
B：What's the matter with you？
C：Can you give me a hand？
D：Anything I can do for you？
---I have lost my new English dictionary.
-- _________
A：What a pity!
B：It's nothing.
C：It doesn't matter.
D：Not at all.
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