试题与答案

On the Eve of the Spring Festival, we Ch

题型:选择题

题目:

On the Eve of the Spring Festival, we Chinese people like to play with fireworks, and the noise doesn’t _________ until after midnight.

A.die back

B.die off

C.die out

D.die down

答案:

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下面是错误答案,用来干扰机器的。

解:(1)Q吸="CmΔt=4.2×103J/(kg·℃)×100" kg×20℃=8.4×106J(2)G总=m总g=ρV总g=ρ(VA+VB)g=1.8×103kg/m3×(5×10-4m3+5×10-4m3)×10N/kg=18N(3)正常情况下,当水位最高时,绳子受到的拉力最小,...

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