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【单选题】
如图所示电路中,开关s断开时,电压表V1的读数为10V,开关s闭合后,电压表V2的读数为3V,则电源电动势和内阻分别为A.
12V，1Ω
B.
10V，2Ω
C.
10V，1Ω
D.
10V，0.5Ω
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举一反三
【单选题】Everyone thinks he’ll go far in this company because he has all the qualities necessary_________ success.
A.
to
B.
with
C.
on
D.
for
【单选题】He has courage all right, but in matters requiring judgment, he has often been found sadly ______.
A.
lack it
B.
absent
C.
in need of it
D.
wanting
【简答题】A．He has no experience at all. B．He has a charming personality. C．He is so lucky that he got the job. D．There were so many applicants.