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【单选题】
下列关于光纤的叙述,不正确的是( ).A.
频带很宽
B.
误码率很低
C.
不受电磁干扰
D.
容易维护和维修
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【单选题】-----Who do you intend to have______your computer? ----- I haven’t decided yet. I wonder if you could help me。
A.
to repair
B.
repaired
C.
to be repaired
D.
repair
【简答题】必需氨基酸是指 但人体不能合成,或者人体合成的速度跟不上需要的氨基酸。
【单选题】A: I was hoping to get some bread from the bakery before it closes. B: ______.
A.
You'd better be quick. It will close at 7:00.
B.
My watch says 6:50,I'm afraid you'll be late. But don't be frustrated.
C.
I don't know when it closes.
D.
I've never been to that bakery.
【单选题】—Can I help you carry the bag? —________________.
A.
Needn’t.
B.
you couldn’t do it.
C.
I could do it myself.
D.
Thank you, but I can manage it myself.
【单选题】Why do you want to leave your previous job?().
A.
I'm hoping to have a better position.
B.
I don't want to work at all.
C.
You won't understand it.
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