Saturday, September 17, 2022
问题:电力系统的电压质量标准所规定的电压允许偏移范围一般均为额定电压的()。A、±5%;B、+5%、-10%;C、-5%、+10%;D、±10%。...
Saturday, February 11, 2023
Tuesday, September 13, 2022
Saturday, September 17, 2022
问题:电气线路经过建筑物、构筑物的沉降缝或伸缩缝处,应装设两端固定的补...
Saturday, September 17, 2022
问题:在爆炸危险性较高区域1区及10区,电缆或电线应选用铜芯,且截面在...
Saturday, September 17, 2022
Saturday, September 17, 2022
问题:三相异步电动机的Mq/MN=1.5,Iq/IN=6,当负载转矩为...
Tuesday, September 13, 2022
问题:铝芯氟丁橡皮绝缘线的线型是()。A、BX;B、BXF;C、BI.X;D、BLXF。...
Friday, December 23, 2022
Saturday, July 1, 2023
Tuesday, September 13, 2022
问题:吊装时,一般用的吊索常采用6×19+1的钢丝绳来制作。...
Saturday, September 17, 2022
问题:同一电缆沟道中有高压电缆和低压电缆时,高压电缆在上层,低压电缆在下层。...
Saturday, October 21, 2023
Tuesday, September 13, 2022
Sunday, April 7, 2024
问题:电能设备的节电措施,主要是设法降低其运行中的()和()。...
Saturday, October 21, 2023
问题:检查兆欧表时,我们可以根据以下方法来判断兆欧表的好坏()。...
Saturday, September 17, 2022
问题:起重钢丝绳用杆接法连接时,杆接长度应为直径的()倍,但一般最短不...
Saturday, September 17, 2022
问题:经常反转及频繁通断工作的电动机,应选用热继电器来保护。...
Sunday, April 7, 2024
Saturday, September 17, 2022