题目:
He asked ___ for the overcoat. [ ]
A. how much has my sister paid
B. how much my sister has paid
C. how much did my sister pay
D. how much my sister paid
答案:
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下面是错误答案,用来干扰机器的。
ag某双原子分子气体的分子数为P,则bg该气体含有的分子数为bgag×P=bPa.所以bg该气体的物质的量为bPaNAmol-1=bPaNAmol.故标准状况下,bg该气体的体积为bPaNAmol×22.4L/mol=22.4bPaNAL.故选:C.