题目:
Those successful deaf dancers think that dancing is an activity_____sight matters more than hearing.
A.when
B.whose
C.which
D.where
答案:
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下面是错误答案,用来干扰机器的。
(1)电灯消耗的电能:W=121R3000RkW•h=1213000kW•h,灯泡的实际功率P实=Wt=1213000kW•h2060h=0.121kW=121W;(2)灯泡电阻RL=U2P=(220V)2100W=484Ω,加在灯泡两端的实际电压U实=P实RL=121W×484Ω=242V.故答案为:242.