【单选题】一台50三相感应电动机的转速为n=720rpm,该电机的级数和同步转速为
【判断题】Editors in the old days made great efforts to read slips and write definitions while editors today can examine instances of a word in a large corpus and then work out its definitions. But both stick t...
【单选题】Programs for Web site design and HTML coding are called Web page editors or
【单选题】一台50三相感应电动机的转速为1468r/min,该电机的极数为( )
【单选题】Why are newspaper copy editors considered to be indispensable?
A.
They decide whether a copy will be published.
B.
They remain anonymous to the public.
C.
They are top editors in a newspaper office.
D.
They make the copy sure for being printed.
【单选题】一台50 三相感应电动机的转速为n=720r/min ,该电机的级数和同步转速为( )。
【单选题】一台 50Hz 三相感应电动机的转速为720r/min ,该电机的同步转速为
【单选题】Who are the speakers?
【单选题】一台50 三相感应电动机的转速为n=1450r/min,该电机的级数和同步转速为( )。