(单选题)2: 随着电力电子技术和微机控制技术的发展,()起动成为三相异步电动机的起动方法,它功能完善、性能优越。 A: 软起动器 B: 直接 C: 自耦减压 D: 星形-三角形减压 ...
(判断题)16: 我国的工业标准频率简称工频是60Hz。 A: 对 B: 错 ...
(单选题)10: 有关电压互感器的使用说法错误的是()。 A: 高压绕组作一次绕组 B: 低压绕组接电压表等负载 C: 二次绕组可以短路 D: 不宜接过多仪表 ...
(单选题)4: RC电路时间常数越大,则过渡过程进行得()。 A: 越慢 B: 不变 C: 越快 D: 以上选项均不正确 ...
(判断题)28: It is our foreign trade policy to trade with foreign countries on the basis of equality and mutual benefits. A: 对 B: 错 ...
(判断题)22: After inspection of the above shipment we found 6 cases breaking. A: 对 B: 错 ...
(单选题)16: Thank you for your interest ______ our host family program for the overseas students in Boulder. A: in B: on C: at D: for ...
(单选题)10: Our country ______ people from all over the world. A: is made of B: is made up of C: is consisted of D: is consisted ...
(单选题)4: She had a paper ___. A: publishes B: publishing C: published D: publish ...
(判断题)28: We need as many record as possible. A: 对 B: 错 ...