有一台Zz型并励电动机PN=7.5kW，UN=110V，η=82.9%，nN=1000r/min，RE=41.5Ω，电枢回路总电阻(包括电刷接触电阻)R=0.1504Ω，在额定负载时，在电枢回路内串入电阻Rr=0.5246Ω，求：
(1)电枢回路串入电阻前的电磁转矩;
(2)电枢回路串入电阻后，若负载转矩不因转速变化而改变，则到达稳定状态后的转速为多少?
We_____knowledgefromourfamilies,schools,jobs,andthemassmedia.
It_______methreeyearstodrawthebeautifulhorses.
重写句子：WelivedinasmalltownwhenIwasasmallchild.WemovedtoShanghailater.Myfatherlandedabetterjobthere.(compound-complexsentence)
Williamhascuthissmoking_____tofivecigarettesaday.
Lookatthisgroupofpeople______beachvolleyball.
