问题:当输送非粘性介质时,泵所需的汽蚀余量()。A、增大B、减小C、不变...
Wednesday, June 7, 2023
Saturday, December 3, 2022
Saturday, December 3, 2022
Sunday, September 11, 2022
问题:汽提塔顶酸性气排量偏小,可能会造成塔顶温度偏低。...
Friday, February 3, 2023
问题:同温同压下,氨在水中的溶解度()硫化氢在水中的溶解度。A、大于B、小于C、等于...
Sunday, May 21, 2023
问题:从离心泵的特性曲线来看,离心泵的扬程是随流量的增加而()。A、增加B、降低C、不变...
Thursday, November 9, 2023
Friday, November 24, 2023
问题:离心泵的流量.扬程.效率与被输送的介质粘度无关。...
Wednesday, May 24, 2023
问题:经预处理后的污水是用()加压后进人塔C01001的。...
Saturday, August 19, 2023
问题:离心泵启动后打不上量的主要原因是()。A、转速偏低B、润滑油少C、介质粘度低D、泵抽空...
Wednesday, March 8, 2023
Friday, December 23, 2022
问题:为防止泵抽空,要从设计,(), 制造三个方面着手。...
Thursday, September 15, 2022
问题:含硫污水能电离成(),能互相起()反应和()反应。...
Sunday, December 25, 2022
Sunday, August 13, 2023
问题:离心泵机械密封泄漏率要求重质油不超过()滴/分。A、30B、20C、10D、5...
Friday, July 28, 2023
Tuesday, September 13, 2022
Saturday, December 3, 2022
Tuesday, December 12, 2023
问题:氨溶解于水中,其溶液呈()性。A、酸性B、中性C、碱性...
Friday, November 11, 2022