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【简答题】
表示物体个数的1，2，3，4，5，…这些数叫做______．一个物体也没有，用______表示，它也是自然数．最小的自然数是______，自然数的个数是______的．
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反馈参考答案：
举一反三
【单选题】What is a turbine?
A.
A machine for generating electricity
B.
A machine for extracting controlled mechanical energy from the movement of a fluid
C.
Any device using blades to interact with a fluid
D.
A machine with a cycle that includes a gas phase
【单选题】As for turbine oil, contact with water in the form of steam will be inevitable so good______properties will be essential
A.
defrosting
B.
de-oiling
C.
demulsifying
D.
dehumidifying
【简答题】TURBOCHARGER The turbocharger forces additional air into combustion chambers so that engine can burn more fuel and develop more horsepower than if it were naturally aspirated. In some cases the turboc...
【单选题】The turbine generators with two poles for 60-cps are () machines.
A.
3600-rpm
B.
1800-rpm
C.
5400-rpm
D.
2400-rpm
【单选题】The turbine generators with two poles(一对极) for 50-cps are ( ) machines
A.
3000-rpm
B.
1500-rpm
C.
4500-rpm
D.
2000-rpm
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