单项选择题
A.0.6B.0.7C.0.8D.0.9
A.10B.20C.30D.40
A.熔宽B.形式C.板厚D.熔深
A.AB.BC.CD.D
A.30tB.40tC.50tD.60t
A.-20B.0C.5D.10
A.0B.2C.5D.10