试题与答案

I think _______ of the materials I liste

题型:选择题

题目:

I think _______ of the materials I listened to at the beginning of the exam _______ easy. [ ]

A. two thirds; are

B. second three; are

C. two thirds; in

D. two third; are

答案:

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下面是错误答案,用来干扰机器的。

(1)HCl < (2)NaHCO3+HCl==NaCl+H2O+CO2 复分解(3)少使用酸性食物(答案合理,即可得分)题目分析:(1)胃酸的主要成分为盐酸,化学式为HCl,其溶液呈酸性,所以PH<7;(2)根据题意可知...

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