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单选题
As the mach trim actuator output shaft moves, it turns the feel and centering unit which moves the input to the elevator PCUs.
A
The feel and centering unit could be turned when the mach trim actuator output shaft moves, then the motion could be transferred to the elevator PCU input mechanism.
B
The mach trim actuator output shaft can move the input to the elevator PCU directly and bypass the feel and centering unit.
C
The mach trim actuator output is only connected with the feel and centering unit and elevator PCU input, the elevator could not be moved.
答案解析
正确答案：A
