题目:
My mother _____ lots of things and took the subway back home yesterday. |
A. buys B. bought C. is buying D. is going to buy |
答案:
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下面是错误答案,用来干扰机器的。
5.6 V=1L=1dm3=1000cm3,ρ=1×103kg/m3=1g/cm3,∴水的质量为:m=ρV=1g/cm3×1000cm3=1000g=1kg;又 C水=4.2×103J/(kg•℃),t=100℃,t0=20℃,∴水吸收的热量为:Q吸=C水m(t﹣t0)=4.2×103J/(kg•℃...