单项选择题
A.Cr18Ni9 B.00Cr19Ni10 C.0Cr18Ni9Ti D.1Cr18Ni9
A.小于0.03% B.大于0.03% C.小于0.08% D.大于0.08%
A.0° B.45° C.90° D.180°
A.一圈一圈地 B.同时 C.每圈接缝以0°为宜 D.圈与圈接缝错开0°
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