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【单选题】
某建设项目有一台设备，目前实际价值8000元，预计残值800元，第一年的设备运行成本600元，每年设备的劣化增量是均等的，年劣化值300元，则设备的经济寿命为( )元。A.
5
B.
6
C.
7
D.
10
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【简答题】某三相异步电动机，极对数p = 2，定子绕组三角形联结，接于50 Hz、380V 的三相电源上工作，当负载转矩为91 N·m 时，测得线电流为30 A，P1= 16 kW，n =1470 r/min，求该电动机带此负载运行时的效率为 %（保留一位小数）。
【单选题】Which of the following is good for the economy according to Eliot Spitzer?
A.
Law enforcement approach.
B.
Decisions open to question.
C.
The honour code among CEOs.
D.
Board oversight and self-regulation.
【单选题】For the economy to be in equilibrium , income must equal expenditure.
A.
good condition
B.
balance
C.
progress
D.
equation
【简答题】基因工程是通过体外重组将甲生物体的基因转入乙受体生物体内进行表达的生物技术。获取目的基因的方法有: 、 、 、 。
【单选题】Which of the following have to be in equilibrium for the economy to be in equilibrium?
A.
the money market only
B.
the goods market only
C.
the output and assets markets
D.
the savings and investment markets
E.
the goods and output markets
【单选题】Economic growth did not make it more flexible for the home economy to obtain the new goods and services because _____.
A.
the family was not efficient in production
B.
it was illegal for the home economy to produce them
C.
it could not supply them by itself
D.
the market for these goods and services was limited
【单选题】The worst thing that could happen for the president and the Democrats is for the economy to continue to ( ) and they get blamed for it.
A.
worse
B.
deteriorate
C.
detect
D.
adverse
【简答题】某三相4极笼型异步电动机，其定子绕组星形联结，该电动机的技术数据为：P N =11kW，U N1 =380V，n N =1430r/min，λ m =2.2，用它来拖动T z =0.8T N 的恒转矩负载运行。求：
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