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【单选题】
把一个L= 0.1H的电感接到 f=50Hz, U=10V的正弦电源上,求感抗XL为 。A.
3.14Ω
B.
31.4Ω
C.
314Ω
D.
3140Ω
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【简答题】100Base-FX中的100表示___,Base表示___,FX表示___。
【单选题】---It’s a long time _____ I saw you last. ---Yes, and what a pity it is now that it will be a long time _______ we see each other again.
A.
before; since
B.
since; when
C.
since; before
D.
when; before
【单选题】When you are having a old ______.
A.
it is always the same kind of cold that you had last time
B.
it may be the same kind of cold that you had last time
C.
it is certainly not the same kind of cold that you had last time
D.
it is probably not the same kind of cold that you had last time
【简答题】IEEE802.3 的100BASE-FX中的FX表示为 。
【简答题】具有“过桥”特征的药材是( )A. 黄连 B、黄芪 C、黄柏 D、黄芩
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