【判断题】两个信号分别从运放同向输入端和反向输入端进入,则输出信号一定是输入信号之差。
【判断题】变极调速后,如果不改变电源相序,则异步电动机的转向就不会发生改变。
【单选题】The new study concluded that being bilingual is found helpful
A.
only when you use a foreign language to talk with foreigners.
B.
only when you have to learn two languages in the same setting.
C.
only when you speak different languages in school and at home.
D.
only when you speak foreign languages both in school and at home.
【单选题】When hiring new employees, we only offer positions to the applicants______qualifications match the company's standards.