A.水平安装 B.垂直安装 C.不做要求
A.1/4~2/4 B.1/4~3/4 C.1/2~2/3 D.1/3~2/3
A.垂直 B.倾斜 C.水平 D.任意角度
A.50 B.60 C.80 D.100
A.1300-1500 B.1200-3000 C.1500-1700 D.1200-2800