A.不宜小于1m和宜采用1:8 B.不宜小于0.8m和宜采用1:6 C.不宜小于1m和宜采用1:3 D.不宜小于1.5m和宜采用1:7
A.2 B.3 C.1 D.4
A.2.2 B.2.2~4.5 C.3.5~7 D.4~6.5