炭黑是不透明的,可以防止辐射热传到推进剂内部.Carbon black is an opacifier which prevents radiant energy transmission to the interior of the propellant.研究了纳米炭黑水泥砂浆的导电性和电热特性.Research of the nano carbon black cement mortar electrical and electro...
苋一种普通的野草 ( 藜藜属 ),长有叶面有花斑的长矛 状 叶子,开有绿色的小花.A common weed ( Chenopodium album ) having lance - shaped leaves with a mealy surface and small green flowers....
He was short and stocky, and had a thick neck.他矮壮结实，脖子很粗。He is stocky though not chubby.他长得敦实,可并不发胖.He always feels ashamed for his short, stocky figure.他矮壮的体形总是让他觉得羞愧。...