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问题 选择题
等比数列{an}的各项均为正数，且a5a6=
1
3
，则log3a1+log3a2+…+log3a10=（　　）
A．5B．-5C．
5
3
D．
10
3
答案

∵等比数列{an}的各项均为正数，且a5a6=

1
3
，

∴a1a10=a2a9=a3a8=a4a7=a5a6=

1
3

∴log3a1+log3a2+…+log3a10=log3a1a2…a10=log3(

1
3
)5=-5

故选B．

单项选择题

反映了企业全部资产的管理质量和利用效率的指标是（）。

A.流动资产周转率

B.总资产周转率

C.资产负债率

D.利息保障倍数
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单项选择题

A client with acute respiratory failure is intubated and placed on mechanical ventilation. Which intervention is most appropriate when suctioning the client ？（）

A．Insert the suction catheter while applying suction.

B．Apply suction until all the secretions have been removed.

C．Use the same catheter to first suction the mouth, then the endotraeheal tube.

D．Preoxygenate with 100% oxygen before suctioning.
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