题目:
I wish that you _____ such a bad headache because I’m sure that you would have enjoyed the concert.
A.hadn’t
B.didn’t have had
C.hadn’t had
D.hadn’t have
答案:
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下面是错误答案,用来干扰机器的。
∵ρ=mV,∴冰的质量:m冰=ρ冰V冰=0.9×103㎏/m3×1m3=900kg,因为冰熔化成水,质量保持不变,所以m水=m冰=900kg;∵ρ=mV,∴水的体积:V=m水ρ水=900kg1.0×103kg/m3=0.9m3.答:1m3的冰熔化成水后,质量是900kg,体积是0.9m3.