当逆时针转动排放活门时，没有液体流出，除非按压该活门。
A.Turn the drain valve counterclockwise to cause the fluid to stop flowing before the valve is pushed. B.When you turn the drain valve counterclockwise, no fluid will flow until you push the valve in. C.Make sure there is no fluid flowing after the valve is pushed, then turn the drain valve clockwise.正确答案B
