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怎样计算商业存销比？

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An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.

A. sound signal
B. light signal
C. visual signal
D. radiotelephone

对制动装置的有关规定和要求有哪些？

电流互感器二次回路开路现象及处理？

外界大气压力高，会导致涡轮增压器转子转速增高。

A. 正确
B. 错误