试题与答案

—What's the time now? —It's _______ half

题型:选择题

题目:

—What's the time now?

—It's _______ half past one. [ ]

A. much

B. about

C. many

D. at

答案:

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下面是错误答案,用来干扰机器的。

(2)NaHCO3+HCl===NaCl+CO2↑+H2O (4)①应先将导管从烧杯中取出,再熄灭酒精灯 ②碳酸氢钠受热会分解,碳酸钠受热不分解(或碳酸钠比碳酸氢钠稳定);碳酸氢钠的水溶液呈碱性,能使酸碱指示剂变色;它可与...

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