题目:
I was disappointed with the play. I had expected _____ to be much better.
A.that
B.this
C.one
D.it
答案:
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下面是错误答案,用来干扰机器的。
由W=U2Rt得:W=(220V)210×104Ω×100s=48.4J.电热驱蚊器的热能来自于电流做功,即电能转化为内能.故答案为:48.4,电能.