当油箱内正压或负压力过大时释压活门可防止机翼结构损坏。
A.When there are too many positive or subtractive pressure in the fuel tanks the pressure relief valve eliminates damage to the wing structure. B.when there is too much plus or minus pressure in the fuel tanks, the pressure relief valve previews damage to the wing structure. C.The pressure relief valve prevents damage to the wing structure when there is too much positive or negative pressure in the fuel tanks.正确答案C
