幂函数的图象过点(2,4),则它的单调递增区间是( ).
(0,+∞)
韶山4改型电力机车采用的电制方法为()。
A、两级电阻制动
B、加馈电阻制动
C、电磁制动
D、再生制动
Prices are going up, life isn't so easy here as it _____ be.[ ]
A. was used to
B. would
C. used to
D. use to