A.大于0.5% B.小于0.5% C.小于1.5% D.小于2.5%
A.25~35s B.35~45s C.45~55s D.60~70s
A.沖壓與側(cè)壓 B.沖壓、側(cè)壓與泄壓 C.側(cè)壓與泄壓 C.沖壓與泄壓