单选题

If you do not install the rigging pin, the elevators will move down when there is no pressure in the system.

A After the system is pressurized, the elevators will drop down no matter where the rigging pin is installed.

B Without the rigging pin, the elevators will go down when there is no pressure in the system.

C The rigging pin can prevent the elevators from retracting and expanding when the system is de-energized.

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正确答案：A （备注：此答案有误）

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