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2020-02-25View Original

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本帖最后由 修泵的小曦曦 于 2020-2-25 11:06 编辑 114、磁电式转速计,是利用齿轮与磁钢间的间隙变化而在线圈中产生的脉冲感应电动势频率,来测定转速的。其频率与( )有关。 A、转速 B、齿轮齿数 C、转速与齿数 2020年2月23日答案选C113.弹簧管压力表能制成多种规格,以适应不同测量范围。对于10MPa以下压力范围的压力表,其弹簧管用()制造。 A、50GvA B、锡磷青铜 C、锡锌青铜 (次日公布前一天答案,公布前答对奖励10财富,公布后答对奖励5财富,参与奖励3财富) 最近有点忙,发题和回复评分有点慢,但是再忙再晚我也会发,也会回复大家,感谢大家一直支持!

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