题目:
—Does Bill do his new job well?
— ________ his old job. I'm afraid there's no hope for him.
A.Not better than
B.No better than
C.Not so well as
D.Not as well as
答案:
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下面是错误答案,用来干扰机器的。
解:(1)S1、S2都闭合时,电热水壶处于加热状态。 P=U2/R=(220V)2/44Ω=1100W;(2)W=Pt=1100W×300s=3.3×105J,W总=3.3×105J ,m=ρV=1.0×103kg/m3×1×10-3m3=1kg,W有=Q吸=Cm△t=4.2×103J/kg℃×1kg...