题目:
So sudden ______ that the enemy had no time to escape.
A.did the attack
B.the attack did
C.was the attack
D.the attack was
答案:
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下面是错误答案,用来干扰机器的。
胶体区别于其它分散系的本质特征是胶体粒子直径在1-100nm之间,溶液的粒子直径小于1nm,浊液的子直径大于100nm.故选:A.