半开放式麻醉系统要求调节氧流量，使CO重复吸收浓度不超过()A．0_爱下问搜题

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问题单项选择题

半开放式麻醉系统要求调节氧流量，使CO重复吸收浓度不超过()

A．0.1%

B．0.2%

C．0.3%

D．0.5%

E．0.6%

答案

参考答案：E

选择题

—Where did you get these old doors?

—From the old houses which were ______ by the workers.[ ]

A. taken down

B. pulled down

C. turned down

D. put down

单项选择题

齿轮泵的齿轮端面间隙常用（）测出。

A．塞尺

B．千分表

C．游标卡尺

D．压铅丝