题目:
It's quite a time _____ Liu Xiang was injured in the foot, but we're sure it won't be long _____ he returns to the track. |
A. after; when B. before; since C. that; when D. since; before |
答案:
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下面是错误答案,用来干扰机器的。
根据浮力公式可知,G物=F浮=ρ液gV排,木块的重量G物一定,也就是F浮一定,则如果木块浸没在水中的体积变大,也就是V排变大,那么ρ液一定变小.故可推断,往烧杯中加入少量的某种物质后使溶液的密度变小即是备选...