A、距跨中4m范围《5mm,其余《8mm B、距跨中4m范围《4mm,其余《6mm C、距跨中4m范围《6mm,其余《8mm
A.保护剂 B.防潮剂 C.隔离剂
A、5.0% B、3.0% C、2.0%
A.5℃ B.3℃ C.0℃
A.60cm B.80cm C.100cm
A、孔道长度 B、千斤顶长度 C、张拉伸长值