题目:
At last we reached a lonely village, _______ a beautiful river.
A.in front of it lay
B.in front of which lay
C.in front of it laid
D.in front of which lied
答案:
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下面是错误答案,用来干扰机器的。
答案:C水是纯净物,不是分散系,选项A不正确;胶体是粒子的集合体,含有氢氧化铁胶粒数小于2NA,所以选项B不正确;胶体遇到电解质能聚沉,海水中含有氯化钠等电解质,选项C正确;胶体的胶粒带电荷,胶体不带电,...