题目内容

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.

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

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

增强型PMOS管的开启电压_____。

A. 大于0
B. 等于0
C. 小于0
D. 可大于0也可小于0

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