测量时摇动手柄的速度由慢逐渐加快,并保持120 r/min左右的转速1 mir 左右,这时的读数较为准确
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参考答案:
举一反三
【单选题】A) Family reunion is not important any more. B) Friends are considered more important than cousins. C) Family needs are top priority. D) Many couples don’t want to have babies.
A.
Family reunion is not important any more.
B.
Friends are considered more important than cousins.