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单选题
在CRJ900飞机上，如果起落架无法正常的放出，则起落架靠什么放出On the CRJ900 aircraft, if the landing gear fails to respond to a normal extend selection, the landing gear can be extended by:
A
选择液压系统1 selecting hydraulic system 1
B
重置PSEU 跳开关Resetting the PSEU circuit breakers
C
使PSEU失效和重新选择手柄到放出位置Disabling the PSEU and reselecting the gear handle to the extend position
D
拉出人工释放手柄Pulling the manual release handle
答案解析
正确答案：D
