Shaanxi new chemical plant will add "security lock"

Recently, the Shaanxi Provincial Bureau of Security Supervision, the Shaanxi Provincial Development and Reform Commission, the Ministry of Industry and Information Technology of Shaanxi Province, and the Department of Housing and Construction of Shaanxi Province jointly issued the "Shaanxi Pr

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Ou Yide's Enlightenment to China's Auto Parts Industry

1.644 trillion yuan a year into the account, what is this concept? Only slightly lower than Shanghai's GDP in 2010 (1.687242 billion yuan). This is not the financial industry, nor is it the income of the steel industry. It is the sales amount of the Chinese auto parts industry in 2010,

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Analysis of parallel cone gears

The approximate expansion of the spherical involute is not possible because the spherical involute [1] cannot be flattened, and is replaced by an approximate involute profile. As shown, D=NO1OC is called the pitch angle, and the cone CO1C1 is tangent to the bevel gear. CC1 at the big end circle, th

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