单项选择题
A.1.0m;1.5m B.1.5m;1.0m C.1.2m;2.0m D.1.2m;1.5m
A.15~20mm B.20~25mm C.20~30mm D.25~30mm
A.0.4mm;10% B.0.5mm;10% C.0.6mm;10% D.0.5mm;15%