A.100mm B.70mm C.50mm D.30mm
A.大于100mm B.大于600mm C.大于500mm D.大于400mm
A.不宜小于1m和宜采用1:8B.不宜小于0.8m和宜采用1:6C.不宜小于1m和宜采用1:3C.不宜小于1.5m和宜采用l:7