电动机三相定子绕组在空间位置上彼此相差[填空(1)]。

单项选择题剩余精力说的代表人物是______。 A．拉察鲁斯 B．格鲁斯 C．席勒和斯宾塞 D．阿普利登

单项选择题According to the 3rd video clips,as a medical receptionist, it is not a proper way to__________ when answering the telephone? A、state the name of the office as well as your name. B、keep the patients waiting for a long time. C、speak in a polite and professional manner D、answer between second and third ring