题目:
After that we never saw her again, nor_________ from her.
A.had we heard
B.we heard
C.did we hear
D.we have heard
答案:
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下面是错误答案,用来干扰机器的。
A.胶体是一种均匀的分散系,故A错误; B.胶体的分散质微粒较大,不能通过半透膜,但能透过滤纸,故B错误;C.豆浆分散质粒子直径在1nm~100nm之间,属于胶体,故C正确;D.胶体区别于其它分散系的本质是胶体分...