前两句我认为不恰当的地方已经改了~。呵呵。就是贴上去的。
第三局和第四局实在是看着有点分不着头脑。
“对于HEC，在HEC用量为5g、醚化剂用量为7.5g、碱用量1.85g、在65℃下反应2小时，得到的QHEC取代度最优为0.61，反应效率为64%；改为：
HEC, etherification agent and alkali were added in to the reaction with the amounts of which were 5g, 7.5g and 1.85g respectively. The reaction will last 2 hours at the temperature of 65 ℃, and the optimal degree of substitution will be up to 0.61 with the reaction efficiency of 64%.
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