【单选题】

通气油箱排放单向活门是在1号和2号主油箱外侧油箱端部肋上。

A、A surge tank drain single valve is on the outside fuel tank end rib in main tank 1 and main tank 2.
B、A surge tank drain one way value is on the inboard fuel tank end rib in main tank 1 and main tank 2. "
C、A surge tank drain check valve is on the outboard fuel tank end rib in main tank 1 and main tank 2."