短语词组短语bismuth base alloy 铋基合金zinc -bismuth alloy 锌铋合金tin -bismuth alloy welding method 锡铋合金焊lead bismuth alloy 铅铋合金Zinc -bismuth alloy electrode 锌铋合金电极Partial tin -bismuth alloy coating 局部镀锡 返回 bismuth alloy