Friday, October 6, 2023
Thursday, September 15, 2022
Monday, October 31, 2022
Saturday, December 3, 2022
Wednesday, May 24, 2023
问题:有一台离心泵叶轮的直径是250mm,此泵的流量是100m3/h,现将其叶轮直径车削为225mm,问车削叶轮后泵的流量为多少?
Saturday, March 16, 2024
Wednesday, May 24, 2023
问题:两台性能相同的离心泵串联后的总流量()每台泵单独工作时的流量。
Tuesday, September 13, 2022
Sunday, December 25, 2022
Saturday, December 3, 2022
Saturday, December 3, 2022
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
Sunday, December 25, 2022
Wednesday, October 19, 2022
Wednesday, September 6, 2023
Saturday, August 19, 2023
问题:风开式调节阀在输出风压减少时,调节阀关小,输出风压增大时,调节阀开大。
Tuesday, September 13, 2022
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
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
问题:按安全管理规定,在有毒介质的泵房和机房动火是()。A、特殊用火B、一级用火C、二级用火D、三级用火
Tuesday, December 12, 2023