短语词组短语shrinkage e allowance 收缩容许量metal -shrinkage allowance 金属收缩留量welding shrinkage allowance 焊接收缩量Recommended Shrinkage Allowance Report 推荐的收缩率allowance for shrinkage 收缩裕度;收缩留量;许可收缩量 返回 shrinkage allowance