【单选题】The DC excitation to the field of brushless synchronous generator is generally produced by ______.
A.
an exciter driven by the same prime shaft with the generator
B.
an exciter driven by external prime mover
【简答题】函数 的铅直渐近线为 _____________.
【单选题】下列有关标准化方法的说法,错误的是
E.
直接法需选定标准人口或标准人口构成比进行标化
【单选题】The DC excitation to the field of brushless synchronous generator is generally produced by____.
A.
An exciter driven by the same shaft with the generator
B.
An exciter driven by external prime mover
【单选题】下列对贾宝玉的描述不正确的是()。
B.
他被“天”抛弃意味着他进入了无限、永恒的人生。
【单选题】The DC excitation to the field of brushless synchronous is generally produced by ()
A.
an exciter driven by the same shaft with the generator
B.
an exciter driven by external prime mover
【多选题】下列有关标准化率的说法正确的是:
D.
如果抽样研究,样本标准化率的比较同样要考虑抽样误差的大小
【单选题】The DC excitation to the field of brushless synchronous generator is generally produced by_____
A.
a exciter driven by the same shaft with the generator
B.
a exciter driven by external prime mover