5.应用简易呼吸器一次挤压可有___ ml空气进入肺内,频率应保持___次/分。
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为幽门梗阻患者洗胃时,宜在饭___ h或___ 时进行。
9.常用的呼吸机分为 ___ 型,___ 型和混合型。
The polluted air in the city is badly ___________ the health of the residents.
A. detrimental
B. endangering
C. combating
D. reinforcing
Getting this contract is __________ to the future of his firm.
A. crucial
B. complicated
C. attainable
D. manageable