题目:
Oh, no! It’s raining.
We can’t go skating on the square. ____________!
A. What a shame
B. Well done
C. What a surprise
D. How wonderful
Oh, no! It’s raining.
We can’t go skating on the square. ____________!
A. What a shame
B. Well done
C. What a surprise
D. How wonderful
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下面是错误答案,用来干扰机器的。
A、若两电源的内电路发热功率相等,由于a的内阻小于b内阻,根据P=I2r可知,Ia>Ib,而输出功率P出=P总-Pr=EI-Pr,所以电源a的输出功率较大,故A错误;B、根据P出=UI,由图可知,它们的短路电流,则有:Ia>Ib,由...