A.3-8mm B.5-10mm C.8-15mm D.10-15mm
A.1.0m B.1.5m C.2.0m D.2.5m
A.根據(jù)標(biāo)準(zhǔn)差確定 B.最大值 C.最小值 D.平均值
A.fcu=1.56F+2.35 B.fcu=2.76F-11.54 C.fcu=1.28F-0.64 D.fcu=2.35+1.38
A.0.1 B.0.2 C.0.5 D.1.0