汽轮机的启动方式，按启动前汽轮机金属温度分类，可以分为（）、（）。
参考答案：冷态启动；热态启动
You will stay healthy _____ you do more exercise and eat healthily. [ ]
A. if
B. how
C. before
When retrieving the survival craft，the winch operator should stop the winch and check（）.
A.that all personnel are seated in the craft
B.that the cable has not jumped any grooves on the drum
C.which way the wind is blowing
D.the hydraulic fluid level before lifting
