The useful life of engineering plastics was predicted within the storage period using a polynomial fitting curve method, and its storage life deadline was inspected. 運用多項式擬合曲線(xiàn)方法對輕武器用工程塑料在貯存期內進(jìn)行壽命預測，考核輕武器用工程塑料的貯存壽命期限。
On the basis of a composing method of universal harmonic trapezoid motion law, nondimensional general curve formulation of driven cam is built. 摘要基于通用簡(jiǎn)諧梯形組合運動(dòng)規律的構成方法，建立了凸輪機構從動(dòng)件無(wú)因次通用曲線(xiàn)方程。
