如果进气活门阀瓣不可维修，将进气阀锁定在全开位置。
A.Lock the air inlet valve in the fully open position unless the air inlet flap is not serviceable. B.If the air intake flap is not serviceable, lock the air inlet valve in the fully open position C.Once the air intake flap is serviceable lock the air inlet valve in the fully open position.正确答案B
