Saturday, September 10, 2022
Thursday, September 15, 2022
叶片泵流量为零时的扬程称为()。A、正常操作扬程B、最大需扬程C、额定扬程D、关闭扬程...
Wednesday, December 6, 2023
泵站的电机间一般是放置动力设备、配电设备、起重设备的场所。...
Saturday, September 10, 2022
化工生产中常见的几种离心泵是以下哪项()。A、水泵、油泵、杂质泵B、水泵、油泵、气泵C、油泵、气泵、杂质泵D、水泵、杂质泵、气泵...
Tuesday, June 27, 2023
Thursday, September 15, 2022
继电器型号DX-11中的文字符号X代表()继电器。A、电流B、中间C、时间D、信号...
Saturday, September 2, 2023
改变泵的()可以改变离心泵的性能。 A、扬程B、效率C、电机功率D、性能曲线...
Tuesday, August 15, 2023
DN600以下的电动阀门,主丝杆下端极限余量值一般为()。...
Saturday, September 10, 2022
Saturday, September 10, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
中性点不接地系统发生单相接地故障时电压变化的基本特点是()。...
Thursday, September 15, 2022
Saturday, September 10, 2022
Thursday, September 15, 2022
Saturday, September 10, 2022
Thursday, September 15, 2022
流量与扬程有关的泵是()。A、离心泵B、柱塞泵C、齿轮泵D、往复泵...
Friday, November 3, 2023
Saturday, September 10, 2022
制造厂根据泵的性能,在保证泵能连续、稳定地排出液体,且泵的温度、...
Sunday, September 11, 2022