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2019-05-20View Original

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本帖最后由 3983596_FPPZ 于 2019-5-21 09:03 编辑 bk14.jpg答题及管理规则: 1、每题答案全部错误,积极参与奖励2财富; 2、答案部分(答对一道)正确奖励5财富;答案全部正确奖励8财富; 3、回答奖励每人限一次; 4、每个回复限管理评分一次; 5、回复后可见答案及解释; 6、回复奖励在48小时内有效。 学*又拿奖,天天来逛逛 1、部分流泵(也称切线泵)是将液体动能转化为压能的直观典型的泵结构( ); 2、多数情况下,多级泵高压端和低压端的机械密封不能整体互换使用( )。 答案:1、正确; 2、错误(经泡沫超版提醒,答案确有争议,但掌握知识第一:对于大螺纹锁紧、弹簧旋向有要求、两端压力值差别大、轴径尺寸差别大的不能互换,其余可互换)。

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