A.A機和B機同時接受值班員命令 B.B機接受值班員命令,A機不接受 C.A機接受值班員命令,B機不接受
A.4.75-5.25VDC B.4.75-5.25VAC C.3.75-4.25VDC D.3.75-4.25VAC
A.5 B.6 C.7 D.8