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麻花豆星空天美糖心mv-星麻花传媒mv-星空天美梦幻mv免费-天美麻花星空果冻mv-62星空天美梦幻糖心mv-天美电影免费在线观看2. Look at the qualification certificate: see whether it has up to standard production and manufacturing qualification certificate, enterprise business license and ISO enterprise qualification certificate, etc. this kind of stainless steel rivet is the reasonable evidence to prove the overall strength of the enterprise.

3. Looking at the commodities, we must point out the technical and professional methods here. We will show you some application methods for reference only

麻花豆星空天美糖心mv-星麻花传媒mv-星空天美梦幻mv免费-天美麻花星空果冻mv-62星空天美梦幻糖心mv-天美电影免费在线观看① According to the appearance:

A. Does the top of your head shine

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C. Head is round mouth, umbrella head, small flat head, or frosted.

D. Is there a protuberance at the root due to the crack of the main mode

E. Is the wound leveled

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G. Is the rivet bar scratched and uneven

麻花豆星空天美糖心mv-星麻花传媒mv-星空天美梦幻mv免费-天美麻花星空果冻mv-62星空天美梦幻糖心mv-天美电影免费在线观看② Whether the specifications of each position are in line with the production and manufacturing regulations. The important index values such as the diameter from the beginning, the diameter of the rod, the length of the rod to the depth of the triple lock rivet must be measured to more than two or three times, and 10-20 pieces of samples should be inspected each time. In the case of accurate measurement, we must adopt the standard size, standard precise measurement attitude, so as to ensure the effectiveness of accurate measurement.

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