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【简答题】
试述低压断路器有哪些保护功能？
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】B4U2expressions in use.docx
【简答题】Expressions in use ( B4 Unit 2).docx
【判断题】深层空气过滤介质主要有两种,一种是以纤维状物(棉花、玻璃纤维、涤纶、微尼纶等)或颗粒状物质(如活性炭)为介质所构成的过滤器;一种是以微孔滤纸、滤板、滤棒构成的过滤器。
A.
正确
B.
错误
【简答题】B2U2expressions in use.docx
【简答题】Expressions in use: 2(1分)
【单选题】听力原文：M: Jenny, could you forward this memo to all the staff? W: Sorry, the computer broke down just now: I' ll do it for you as soon as I have it fixed. Q: What does the woman imply? (13)
A.
She has to post the memo instead.
B.
She has to turn down the man' s request.
C.
She' s not sure if the computer is fixed.
D.
She can't send the memo right now.
【单选题】听力原文：M: Jenny, could you forward this memo to all the staff? W: Sorry, the computer broke down just now. I'll do it for you as soon as 1 have it fixed. Q: What does the woman imply? (13)
A.
She has to post the memo instead.
B.
She has to turn down the man's request.
C.
She's not sure if the computer is fixed.
D.
She can't send the memo right now.
相关题目：
【判断题】深层空气过滤介质主要有两种,一种是以纤维状物(棉花、玻璃纤维、涤纶、微尼纶等)或颗粒状物质(如活性炭)为介质所构成的过滤器;一种是以微孔滤纸、滤板、滤棒构成的过滤器。
A.
正确
B.
错误