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【单选题】
A car is made up of more than 30,000parts. Each part in a new car is as weak as a baby. So a new car requires proper care and servicing. If you’re unfamiliar with the parts, you have to read through the owner’s instructions carefully. First of all, the brakes (刹车) of your car are important for safety (安全) reasons. Having them checked regularly can reduce the risks of accidents. Another important thing to consider is engine care. Always remember that the life and performance of your car engine depend on the engine oil. Replace the engine oil when recommended. If you feel the engine is very hot especially during summer it is probably because the cooling system doesn’t work well. You’d better get the cooling system serviced before the start of summer. In a word, timely and proper servicing is an important task for car owners. Good servicing can not only extent the life of your newborn baby, but also ensure your safety, and the safety of those who share the road with you.
A.
The brakes should be checked regularly ________. to avoid accidents
B.
to raise speed
C.
to reduce cost
D.
to save gas
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参考答案:
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【判断题】晶体三极管的发射区和集电区是由同类半导体(N型或P型)构成的,所以发射极和集电极可以相互调换使用。( )
A.
正确
B.
错误
【单选题】患者,男性,45岁,因肝硬化致食管-胃底静脉曲张,护土应指导患者摄入
A.
低脂饮食
B.
低盐饮食
C.
低蛋白饮食
D.
少渣饮食
E.
低胆固醇饮食
【判断题】晶体三极管的发射区和集电区是由同一类半导体 C N 型或 P 型)构成的,所以发射极和集电极可以相互调换使用。( )
A.
正确
B.
错误
【判断题】CISC 机一定不采用流水技术。
A.
正确
B.
错误
【单选题】下列叙述正确的是
A.
RISC机一定采用流水技术
B.
CISC机一定采用流水技术
C.
采用流水技术的一定是RISC机
D.
以上都不对
【单选题】以下叙述中_____是正确的。
A.
RISC机一定采用流水技术
B.
采用流水技术的机器一定是RISC机
C.
CISC机一定不采用流水技术
D.
RISC机一定不采用流水技术
【判断题】晶体三极管的发射区和集电区是由同一类半导体(N型或P型)构成的,所以发射极和集电极可以相互调换使用。( )
A.
正确
B.
错误
【单选题】以下叙述中____是正确的。【中科院计算所1998年】
A.
RISC机一定采用流水技术
B.
采用流水技术的机器一定是RISC机
C.
CISC机一定不采用流水技术
D.
采用流水技术的机器一定是CISC机
【多选题】海关行使权利的基本原则有( )。
A.
合法原则
B.
适当原则
C.
依法独立行驶原则
D.
依法受到保障原则
【简答题】晶体管的 区和 区是相同类型的半导体,但 区的掺杂浓度较高,基区的掺杂浓度较低且很薄, 区的面积较大,因此 极和 极不可调换使用。
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