又大又粗又刺激免费观看黑人_日本国产精品网站_脱了我奶罩亲我奶头好舒服_粗长巨黑吊进进出出无码_久久中文字幕视频不卡_三年高清在线观看全集下载_18禁高潮出水呻吟娇喘色哟哟_亚洲欧美日韩国产另_午夜福利小视频_2022国产精品不卡a

contact number:

023-67681065

R&D application
Composite materials

The matrix material of the composite material is divided into two major categories of metal and non-metal. Aluminum, magnesium, copper, titanium and alloys thereof are commonly used in metal substrates. Non-metal substrates mainly include synthetic resins, rubber, ceramics, graphite, carbon, and the like.