A.設(shè)計(jì)值 B.設(shè)計(jì)值的80% C.設(shè)計(jì)值的90% D.設(shè)計(jì)值的70%
A.10mm B.15mm C.20mm D.25mm
A.100m B.100根 C.1000根 D.300根