单项选择题
A.交叉卷绕B.平行卷绕C.精密卷绕
A.0.30~0.35g/cm3B.0.32~0.37g/cm3C.0.23~0.27g/cm3
A.0.30~0.35g/cm3B.0.38~0.45g/cm3C.0.23~0.27g/cm3