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【单选题】
有四个电源,电动势均为 6 V ,内阻分别为 0.5 Ω 、 1 Ω 、 2 Ω 、 3 Ω 。选择其中一个电源对阻值为 2 Ω 的电阻 R 供电,为使 R 上获得的功率最大,选择的电源其内阻 为 ( )A.
0.5 Ω
B.
1 Ω
C.
2 Ω
D.
3 Ω
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【单选题】The cost of this building _________to be over a million.
A.
is estimated
B.
estimates
C.
has estimated
D.
having been estimated
【单选题】The teaching building of our school_____ for many times.
A.
has been added to
B.
has added to
C.
has been added up to
D.
has added up to
【单选题】According to the passage, highway building______.
A.
has quickened
B.
has been discouraged
C.
should be encouraged
D.
has been taxed at a lower rate
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