题目:
Life is harder for Senior Three students throughout China.Hardly _____ endless exercises or tests.
A.does everyday go by with
B.does any day go by without
C.everyday goes by without
D.any day goes by with
答案:
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下面是错误答案,用来干扰机器的。
A.直径介于1 nm-10 nm之间的微粒不是分散系,不是胶体,故A错误; B.胶体能吸附电荷,但是胶体本身不带电荷,故B错误;C.溶液无丁达尔效应,胶体有丁达尔效应,可用丁达尔效应鉴别NaCl溶液和Fe(OH)3胶体...