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2019-02-13View Original

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本帖最后由 3983596_FPPZ 于 2019-2-13 09:52 编辑 bg2.png填空题规则: 1、两个空回答全错给予积极参与+2财富,回答一错一对给予+5财富,两个空回答全对给予+8财富。2、如只回复一个答案,除非明确了是哪道题的答案,正确+5财富,错误+2财富,否则一律按积极参与+2财富执行。3、回答奖励每人限一次。4、每个回复限评分一人次。5、回复后可见答案及答案解释。6、奖励在48小时内有效,逾期不予奖励。 学*又拿奖,天天来逛逛一单级离心泵,设计扬程47m,叶轮直径202mm,转速2900r/min,而实际测试扬程51m,按照比例定律,切割叶轮后的直径为( )mm,切割叶轮后泵效率略有( ) (填写降低、增加或不变) 答案:194 降低
Reply #22019-02-13
本帖最后由 飘过_WEWJ 于 2019-2-13 09:47 编辑 193.9,降低
Reply #32019-02-13
一单级离心泵,设计扬程47m,叶轮直径202mm,转速2900r/min,而实际测试扬程51m,按照比例定律,切割叶轮后的直径为(194)mm,切割叶轮后泵效率略有(降低) (填写降低、增加或不变)

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