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【单选题】
中脉压(CVP)正常值为多少A.
4～8cmH2O
B.
5～12cmH2O
C.
5～l0cmH2O
D.
4～12cmH2O
E.
5～14cmH2O
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举一反三
【简答题】热机是把______能转化成______能的机器，______是最常见的热机．
【单选题】Which of the following statements about labor unions can be concluded based on the information in the passage?
A.
Labor unions reached their peak of power in the 1986's.
B.
It took labor unions many years to improve conditions for workers.
C.
The early labor unions failed .because they were not concerned with the well-being of workers.
D.
The early labor unions failed because they could not agree on what they wanted to fight for.
【简答题】热机的分类：最早的热机是______；其次是______；______；______．
【单选题】下列关于热机的效率，说法正确的是 [ ]
A.
热机做的有用功越多，热机效率就越高
B.
热机的功率越大，热机的效率就越高
C.
消耗燃料少的热机，效率高
D.
以上说法都不对
【单选题】甲、乙两台热机，甲的效率比乙的低，其含义是（ ）
A.
甲热机消耗的燃料多
B.
甲热机比乙热机做功少
C.
甲热机的功率比乙热机的小
D.
做相同的有用功，甲损失的能量比乙损失的多
【简答题】______是最早的热机．现代热机种类繁多，构造各异，有______、______、______、______．
【单选题】Focus groups are representatives of customers whose job is to provide you with information on their needs and preferences. {A、B、C}
A.
焦点小组是顾客的代表，他们的工作是把你的需求和喜好提供给顾客。
B.
焦点小组是顾客的代表，他们的工作是给顾客提供需求和喜好。
C.
焦点小组是顾客的代表，他们的工作是给你提供他们的需求和喜好。
【单选题】How can the users of terminals without processing capability acquire the necessary information?
A.
They can simply use a keyboard or a mouse.
B.
They should use a modem to maintain the host system.
C.
They should connect their computer to a satellite system.
D.
They can access its base through the programs on the system.
【单选题】关于热机的效率，下列说法中正确的是（ ）
A.
热机做的有用功越多，热机效率一定高
B.
热机的功率大，热机效率一定高
C.
热机单位时间内消耗的燃料少，热机效率一定高
D.
以上说法都不对
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