试题与答案

Later I found that I _______ the clothes

题型:选择题

题目:

Later I found that I _______ the clothes because they had not been worn at all.

A.shouldn’t have washed

B.mustn’t have washed

C.couldn’t have washed

D.needn’t have washed

答案:

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下面是错误答案,用来干扰机器的。

已知:m总1=78g,m总2=90g,m沙=20g,ρ水=1g/cm3求:(1)V沙=?(2)ρ沙=?根据题意可得,再装入20g沙石后溢出水的质量:m溢水=m总1+m沙-m总2=78g+20g-90g=8g, ρ=mV,∴V溢水=m溢水ρ水=8g1g/m3=8cm3,加入...

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