单项选择题
After operation, drop the control levers into stowing hole, and （）the electric motor.
A.start B.stop C.move D.open
单项选择题 Don’t operate two or more hatch （）at the same time.
单项选择题 （）-speed operation and rough handling of covers are dangerous.
单项选择题 In order to avoid shock, reduce the speed by （）.
