What material may be substituted for zinc when making a poured metal socket ending to a wire rope().
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On a ship,when may a work vest be substituted for a required life preserver?()
翻译:substituted vessel
On an OSV,when may a work vest be substituted for a required life jacket?()
Which item may be substituted for,in the fireman’s outfit,on a cargo vessel?()
On a ship,when may a work vest be substituted for a required life preserver?()