Methyl 2, 6 - dichlorophenoxyacetate is prepared with 2, 6 - dichlorophenol , sodium methoxide and methyl chloroacetate as raw materials.以2, 6- 二氯苯酚 、 甲醇钠甲醇溶液和氯乙酸甲酯为原料,合成了2, 6-二氯苯氧乙酸甲酯.Dimethyl carbonate is synthesized d...
Eachband everybare generally used as determiners before singular countable nouns.一般都作限定词,用于单数可数名词之前.The word “person” is a countable noun.person这个词是个可数名词。Is this word a countable noun or an uncountable noun?一般说来,这里我们用代词来...