The first two digits refer to the approximate percentage content of the hydroxypropoxy group, calculated on a dry basis.
前两个阿拉伯数字表示大概的羟丙基含量， 是在干燥的基础上计算的。
The first two digits refer to the approximate percentage content of the hydroxypropoxy group, calculated on a dry basis.
前两个阿拉伯数字表示大概的羟丙基含量， 是在干燥的基础上计算的。
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