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["["每日一题 équipement械装置】question true 等级: 1、de两题全错给积极参与奖励

2019-01-08View Original

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bg2.png判断题规则: 1、两道题回答全错给予积极参与奖励 2 财富,回答一错一对给予奖励 4 财富,两道题回答全对给予奖励 6 财富 ;2、回答奖励每人限一次;3、每个回复限管理评分一次;4、回复后可见答案及答案解释;5、奖励在48小时内有效。 学*又拿奖,天天来逛逛 1、离心泵临界转速的核算是为了避免共振( ) 2、所有机械密封(包含干气密封)动环的线速度越小越好( ) 答案:正确、错误

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