试题与答案

在竖井和倾斜巷道用绞车上下时,使用的音响信号正确的是为()。A、二声—下降B、一声—

题型:单项选择题

题目:

在竖井和倾斜巷道用绞车上下时,使用的音响信号正确的是为()。

A、二声—下降

B、一声—停止

C、三声—上升

答案:

参考答案:B

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