Structural steel material of main hull structure to be of the quality as required by the Classification Society and shall be free of cracks, lamination, surface defects and other defects.
主船体结构用钢的材料须满足船级社要求，并且无裂纹、迭片结构、表面缺陷和其他的缺陷。
The defects of casting technology and the impurities in copper alloy material cause roughness of faucet surface with large amounts of sand holes.
铸造技术不完善、铜合金原料中的杂质致使水龙头零件表面疏松，并有大量砂眼。
The defects of casting technology and the impurities in copper alloy material cause roughness of faucet surface with large amounts of sand holes.
铸造技术不完善、铜合金原料中的杂质致使水龙头零件表面疏松，并有大量砂眼。
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