abbr.echelon 梯形,梯次编队;
英文例句/中文翻译:
1、
2、
TBA与环氧氯丙烷(EHC)在氢氧化钠溶液的作用下,通过逐步聚合得到TBA型环氧树脂;
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3、
利用稀土络合催化体系催化二氧化碳(CO2)和环氧氯丙烷(ECH)共聚反应,合成出新型高分子材料脂肪族聚碳酸酯(ECHCO2)。
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