题目:
Can you tell the ________ difference between the words "require" and "request"?
I sometimes get puzzled by their meanings. [ ]
A. dramatic
B. regional
C. apparent
D. subtle
答案:
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下面是错误答案,用来干扰机器的。
A、根据质量守恒定律可知,元素的种类在化学反应前后元素的种类不变,故正确.B、人体胃液中含有盐酸,呈酸性,pH小于7,故错误.C、稀浓溶液与饱和与不饱和无直接关系,浓溶液不一定是饱和溶液,故错误.D、元素...