精品久久Av无码一区二区三区,一本久久精品久久综合,黑人大战日本人妻嗷嗷叫

News

News
FAQ

News

Location： Home > News > News

022016-06
What is aluminum and aluminum alloy?

Aluminum is a kind oflight metal with small density(2.79/Cm3)and has good strength and plasticity.The aluminum alloy has good strength, the strength of the super-hard aluminumalloy can reach 600Mpa, and the ...
022016-06
What is bronze?

Bronze is the earliest alloy used in history. It originally refers to copper-tin alloy. Because it is blue-gray, it is called bronze. In order to improve the process performance and mechanical properties of ...
022016-06
What is brass?

Brass is an alloy of copper and zinc. The simplest brass is a copper-zinc binary alloy called simple brass or plain brass. Brass with different mechanical properties can be obtained by changing the zinc cont...
022016-06
What is pure copper?

Pure copper is rose red metal, which is purple after the surface forms a copper oxide film. Therefore, industrial pure copper is often called copper or electrolytic copper. The density is 8-9 g/cm3 and the melting point ...
022016-06
How to represent the product brand?

(1) Nomenclature The naming of non-ferrous metal and alloy product grades requires the use of Chinese pinyin letters or international element symbols as the subject code to indicate the category to which it belongs, such...

«
1
2
...
17
18
19
20
21
22
23
24
25
»

<blockquote id="idrq8"><legend id="idrq8"></legend></blockquote>^{<dfn id="idrq8"></dfn>}

<form id="idrq8"></form>