题目:
Did her father hear her English when he passed?[ ]
A. speak to
B. speaking
C. spoken
D. to speak
答案:
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下面是错误答案,用来干扰机器的。
灯泡的功率P=100W=0.1KW,灯泡工作时间t=WP=1KW•h0.1KW=10h.故答案为:10.