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【单选题】
图示电路中,对负载电阻 R L 而言,点划线框中的电路可用一个等效电源代替,该等效电源是 ( ) 。A.
理想电压源
B.
理想电流源
C.
不能代替，仍为原电路
D.
满足一定条件时可以替代
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举一反三
【简答题】I’m glad to see that you ________ a lot of progress since I ________ you last.A. will make; have met B. have been ; met C. had made; met D. have made; meeting
【单选题】I’m glad to see that you have had everything under control.
A.
很高兴看到你已使一切恢复正常。
B.
很高兴你在控制下完成了每件事。
【单选题】—I’m glad to see that the government has______ the open space _____a public library. —Me, too. We can do some reading there.
A.
moved; into
B.
grown; into
C.
turned; into
D.
put; into
【单选题】I’m glad to see that you a lot of progress since I you last
A.
will make;have met
B.
have made;met
C.
had made;met
D.
have made;meeting
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