题目内容

Rather than spread control among hundreds oreven thousands of local, regional, and nationalagencies that watch various aspects of water use,countries should set up central authorities tocoordinate water policy.In order to raise the efficiency of the water supply,measures should be taken to _______.

A. centralize the management of water resources
B. increase the sense of responsibility of agencies at all levels
C. guarantee full protection of the environment
D. encourage local and regional control of water resources

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When it was introduced, most people did not like itas well as "regular" coffee, and it took severalyears to gain general acceptance.The first paragraph tells us that a new product is________.

A. not easily accepted by the public
B. often inferior to old ones at first
C. often more expensive than old ones
D. usually introduced to satisfy different tastes

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Regardless of its power source, the auto in thefuture will still be the main problem in urbantraffic congestion (拥挤).What is the author's main concern?

A. How to render automobiles pollution-free.
B. How to make smaller and safer automobiles.
C. How to solve the problem of traffic jams.
D. How to develop an automated subway system.

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增强型NMOS管工作在饱和区的条件是_____。

A. vGS>VTN ,vDS≥(vGS-VTN)
B. vGS>VTN ,vDS≥0
C. vGS>0 ,vDS≥0
D. vGS<0 ,vDS≤0

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工作在饱和区的增强型NMOS管_____。

A. iD=Kn(vGS-VTN)2
B. iD=0
C. iD=2Kn(vGS-VTN)
D. iD=gmvGS

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Rather than spread control among hundreds oreven thousands of local, regional, and nationalagencies that watch various aspects of water use,countries should set up central authorities tocoordinate water policy.In order to raise the efficiency of the water supply,measures should be taken to _______.

A. centralize the management of water resources B. increase the sense of responsibility of agencies at all levels C. guarantee full protection of the environment D. encourage local and regional control of water resources

When it was introduced, most people did not like itas well as "regular" coffee, and it took severalyears to gain general acceptance.The first paragraph tells us that a new product is________.

Regardless of its power source, the auto in thefuture will still be the main problem in urbantraffic congestion (拥挤).What is the author's main concern?

增强型NMOS管工作在饱和区的条件是_____。

工作在饱和区的增强型NMOS管_____。

A. centralize the management of water resources
B. increase the sense of responsibility of agencies at all levels
C. guarantee full protection of the environment
D. encourage local and regional control of water resources