In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of ().
A. oil
B. sea water
C. air
D. fresh water
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能耗制动时,主机的状态应是()。 ①主机转速高于发火转速; ②主起动阀关闭,空气分配器工作; ③主起动阀打开,空气分配器工作; ④主机仍按原方向转动; ⑤主机开始反方向转动; ⑥主机已经停油。
A. ①②③⑤
B. ①③④⑤
C. ①②⑤⑥
D. ①②④⑥
FSK符号标志的意义是()
A. 移项键控
B. 移频键控
C. 移幅键控