一般黏土的挖掘和沙、土砾石和装载等轻作业环境。

Light duty operations like the excavation of clays and the loading of sand, earth, and gravel, etc.

youdao

一般黏土的挖掘和沙、土砾石和装载等轻作业环境。

Light duty operations like the excavation of clays and the loading of sand, earth, and gravel, etc.

youdao