适用于在幼儿园、医院、养老院等场所,保护幼儿或行动不便的老弱病残者人身安全的灭火系统是(  )。

适用于在幼儿园、医院、养老院等场所,保护幼儿或行动不便的老弱病残者人身安全的灭火系统是(  )。 A.自动喷水灭火系统 B.气体灭火系统 C.干粉灭火系统 D.

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Which of the following statements about the telephone of the

Which of the following statements about the telephone of the future is NOT true?

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Sn为等差数列{an}的前n项和,S2=S6,a4=1,则a6=__________

Sn为等差数列{an}的前n项和,S2=S6,a4=1,则a6=__________

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It can be inferred from the text that the retail price of pe

It can be inferred from the text that the retail price of petrol will go up dram

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