单项选择题

A.A - 直通;B - 全反;C - 直通
B.A - 交叉;B - 直通;C - 直通
C.A - 直通;B - 直通;C - 交叉
D.A - 交叉;B - 直通;C - 交叉
E.A - 直通;B - 交叉;C - 直通
F.A - 直通;B - 交叉;C - 交叉