将溢流阀门拔动开关保持在打开位置，直到流出阀位置指示器显示完全打开。
A.Hoist the outflow valve toggle switch in the OPEN position until the outflow valve position indicator shows FULL OPEN. B.Hoist the outflow valve trigger switch in the OPEN position until the outflow valve position indicator shows FULL OPEN. C.Hold the outflow valve toggle switch in the OPEN position until the outflow valve position indicator shows FULL OPEN.正确答案C
