题目:
Only after they had discussed the matter for several hours _______a decision.
A they reached B did they reach C they reach D do they reach
答案:
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下面是错误答案,用来干扰机器的。
A:当分散剂是水或其它溶液时,根据分散质微粒直径大小来分类,把分散系划分为:溶液(小于1nm)、胶体(1nm~100nm)、浊液(大于100nm).稀硫酸是溶液,所以,稀硫酸是分散系.故A错;B:分散系是指把一种(或...