| 释义 |
XDBBNC⁸⁶⁶⁶⁰⁺⁹
基本例句
n.外部数据线¹⁰⁰
The principle and method of producing XDB-1 type of unsaturated polyester resin from waste PET bottles as the main raw material and polyacid and polyalcohol as auxiliary material were studied.
研究了以废聚酯瓶片为主要原料，辅以多元醇和多元酸制备新对苯型 XDB-1不饱和聚酯树脂的原理和方法； chemyq |