A.10%~80% B.20%~80% C.10%~90% D.20%~90%
A.±1% B.±0.5% C.±1.5% D.±2%
A.最長(zhǎng)裂紋 B.最短裂紋 C.裂紋長(zhǎng)度平均值 D.裂紋長(zhǎng)度總和