题目内容

在车站（货场）、专用线内，专为内部作业使用、不直接贯通道路的平面交叉，均称平过道，由使用单位负责管理。

A. 正确
B. 错误

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A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted.According to the above sentence, which of the following statements is not true?（）

A. The diameter of a disc is the same as the outer diameter of the pipe
B. We can infer that the valve is opened or closed by rotating the spindle
C. A butterfly valve comprises a disc and a ring body
D. The profile of the butterfly valve is a ring body

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