I often hear the ____ of children playin_爱下问搜题

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问题选择题

I often hear the ____ of children playing happily downstairs at this time of day. [ ]

A. voice

B. noise

C. sound

D. throat

答案

答案：C

单项选择题

行业标准规定烟时仓库相对湿度控制在（）％

A.50％～70％

B.55％～75％

C.55％～65％

D.55％～70％

问答题简答题

轴向位移保护为什么要在冲转前投入？