三相交流发电机的有功功率等于电压、电流和功率因数的乘积。()
参考答案:错
C++语言中的多态性是在编译时通过【 】和模板体现的,在运行时是通过【 】体现的。
You didn't have to write the essay if you didn't want to. It was()
A.compulsory
B.suitable
C.alternative
D.optional