矿用电机车目前都采用（）电动机作为牵引电动机。
A、串激
B、并激
C、它激
D、复激
参考答案：A
I don't like this kind of drink because there's ____________sugar in it . [ ]
A. too many
B. many too
C. too much
D. much too
冲裁的分离过程，按其变形特点，可分为哪几个阶段？
