Which of the following statements concerning butterfly valves is correct?（）<br>A:Special tools are required for lapping or grinding<br>B:It is impossible to throttle flow with a butterfly valve<br>C:To close the valve, it is only necessary to turn the handle a quarter of a turn<br>D:The butterfly valve should never be used in a freshwater system

Which of the following statements concerning butterfly valves is correct?（）
A:Special tools are required for lapping or grinding
B:It is impossible to throttle flow with a butterfly valve
C:To close the valve, it is only necessary to turn the handle a quarter of a turn
D:The butterfly valve should never be used in a freshwater system

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