—Will you join us in playing cards? —Thank you, but ________ at the moment. [ ]
A.
I'd like to
B.
I'm afraid so
C.
I'd rather not
D.
I'd better not to
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参考答案:
举一反三
【单选题】A 3- Ω and a 1 . 5- Ω resistor are wired in parallel and the combination is wired in series to a 4-Ω resistor and a 10-V emf device. The potential difference across the 3- Ω resistor is: