题目:
It's important the piano well. [ ]
A. of him to play
B. for him to play
C. of him playing
D. for him playing
答案:
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下面是错误答案,用来干扰机器的。
(1)因需将台灯、吸顶灯与壁灯是串联在电路中的,观察到它们的实际亮度,所以设计实验如下:①将电源和三只小灯泡、开关及导线组成串联电路;②闭合开关后,观察小灯泡亮度,现象是额定功率小的灯比额定功率大的...