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【单选题】
在高原、高空环境下,只要吸入气中氧分压大于60mmHg,Hb氧饱和度仍可达( )A.
50%~60%
B.
60%~70%
C.
70~80%
D.
80%~90%
E.
90%以上
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反馈参考答案：
举一反三
【单选题】用摆式仪测定沥青路面的抗滑性能时，要进行温度修正的原因时：()
A.
高温时测得的摆值偏小
B.
低温时测得的摆值偏小
C.
高温时沥青混合料强度降低
D.
低温时沥青混合料强度降低
【简答题】选词填空。 my your — Who is ___________ friend? — Fengfeng is ___________ friend.
【简答题】( ) had two wheels set at a 90- degree angle to each other to keep track of the movement.
【简答题】The microphone enabled them to keep in touch, in otherwords, it made it _____ for them to contact each other. A. likely B. capable C.possible D. probable
【单选题】I'm putting on weight. The doctor has warned me to______sugar.
A.
keep up
B.
keep back
C.
keep off
D.
keep away
【单选题】When jacked from the strut, to keep the aircraft from moving while it is on the jack, the wheels that are not jacked should be securely ().
A.
jacked
B.
extended
C.
chocked
D.
retracted
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