单项选择题
What’s the feedback equipment of VSV and VBV’s position to the MEC of CFM56-3 engine? ( )
A．LVDT and electrical cableB．RVDT and electrical cable
C．Arm, lever and flexible shaft
D．Resolver and flexible cable
点击查看答案&解析
的反应，使用正催化剂可以（ ）。
