A.磁粉探伤 B.超声波探伤 C.射线探伤
A.18.2mm B.17.5mm C.17.9mm
A.射线探伤 B.超声波探伤 C.渗透探伤
A.椭圆 B.圆 C.直线
A.5min B.7~30min C.60min
