单项选择题
A.1x2斗口B.1.25x2斗口C.1.25x1.6斗口D.1.2x2斗口
A.1X 1.8斗口B.1X 2斗口C.1.2X 2斗口D.1.2X 1.8斗口
A.1.4斗口B.1.6斗口C.1.8斗口D.2.2斗口