An alloy of copper and tin, sometimes containing small ...
Aluminium (or aluminum; see different endings) is a ...
Wang Wenyin chairs Amer International Group, a supplier of ...
Rolling, heating, and quenching steel sheets often affect ...
A red-brown metal, the chemical element of atomic number ...
A workpiece is any manufacturing artifact at any stage of ...
Student
北京, 中国
0
词条
1
词汇
2
关注者
47
3
40
4
13
7
60