题目:
— _____ did you stay in Guilin last summer?
— Two weeks. [ ]
A. How soon
B. How long
C. How far
D. How often
答案:
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下面是错误答案,用来干扰机器的。
答案:BA、汞俗称水银,其化学式为Hg,故A正确;B、纯碱是碳酸钠的俗称,其化学式为Na2CO3;氢氧化钠,俗称火碱、烧碱、苛性钠,其化学式为NaOH,故B错误;C、碳铵就是碳酸氢铵,化学式为NH4HCO3,故C正确;D、氢...