碳化物一种二元化合物，由碳和一个电正性的元素，尤指钙，组成。
A binary compound consisting of carbon and a more electropositive element, especially calcium.
比起铅来，金属锡的电正性没有二氧化锡的电负性强，所以无法产生可用的电位差。
Metallic tin is not electropositive enough compared with the electronegativity of its oxide to deliver a useful potential difference.
文中用辅助变量法和LILC定阶准则结合来估计电液位置和力偶系统的阶和参数，根据估计参数的渐近正态性确定模型的子阶和时滞。
The instrumental variable method and LILC criterion are used to estimate the order and parameter of electro-hydraulic position and force coupled system.
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