循环冷却水系统基本可分为()
A.敞开式循环冷却水和密闭式循环冷却水系统
B.敞开式循环冷却水和直流式冷却水系统
C.循环冷却水系统和直流式冷却水系统
参考答案:A
He kept thinking of the question whether it was _____ for his father to change the habit of a life time in such
a short time.[ ]
A. possibly
B. probable
C. likely
D. possible
列车通过导曲线半径为355m的9号对称道岔,允许通过速度为()。
A、45km/h
B、50km/h
C、60km/h
D、70km/h