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

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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