What does "wrench-landing gear axle nut" mean in Chinese ?

What does "wrench-landing gear axle nut" mean in Chinese ?

A.起落架横向轴螺母拆卸扳手

B.起落架横向轴螺母安装扳手

C.起落架横向螺栓拆卸扳手

D.起落架横向轴螺栓安装扳手

正确答案是A