sounding lead
柯林斯詞典
1. N a lead weight, usually conical and having a depression in the base for a dab of grease so that, when dropped to the bottom on a sounding line, a sample of sand, gravel, etc, can be retrieved 測深鎚
返回 sounding lead
1. N a lead weight, usually conical and having a depression in the base for a dab of grease so that, when dropped to the bottom on a sounding line, a sample of sand, gravel, etc, can be retrieved 測深鎚