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【单选题】
开式细水雾灭火系统的设计响应时间不应大于( ) s 。采用全淹没应用方式的开式瓶组系统, 当同一防护区内采用多组瓶组时,各 瓶组同时启动,其动作响应时差不应大于( ) s 。A.
60 ， 2
B.
30 ， 2
C.
60 ， 4
D.
30 ， 4
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反馈参考答案：
举一反三
【单选题】I won't give you any help ________ you tell me the truth. It's none of my business.
A.
unless
B.
since
C.
as if
D.
even if
【简答题】I won't give you any help ______ you tell me the truth. It's none of my business.
【单选题】---Will you give this magazine to Tom, please? --___.He doesn't work here any longer.
A.
No, I can't
B.
Sorry, I can't
C.
It’s a pity
D.
Sorry, I won't
【单选题】I won't give you any help ______ you tell me the truth. It's none of my business.
A.
even as
B.
as though
C.
since
D.
even if
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