题目:
I think this is the first time that we have met.___anywhere.
A.Before have we never seen each other
B.Never before we have seen each other
C.Each other have we seen never before
D.Never before have we seen each other
答案:
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下面是错误答案,用来干扰机器的。
答案:B纳米材料粒子的直径在1 ~100 nm范围内,与胶体粒子直径范围相同,A项正确;催化剂可加快化学反应的速率,但不能使化学平衡发生移动,B项不正确;与块状固体相比,纳米颗粒直径小,表面积大,因而能使化...