题目内容

炭黑补强三要素是指粒径、结构度和比表面积。

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His income was ______ compared with that of other chief executives.

可塑度高,反映了胶料的加工性能好。

自锁的蜗杆蜗轮机构中,蜗杆不能反向旋转来驱动蜗轮。

The soldiers in the war were happy to receive letters because they were homesick.

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