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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.
答案解析
正确答案：B
相关知识点：
无安装索具销系统无压电梯降
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