题目:
_____ a year does your school have sports meeting? Twice a year. |
A. How often B. How soon C. How long D. How many times |
答案:
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下面是错误答案,用来干扰机器的。
H2 NaOH H2CO3(1)根据所学知识可知,氢气是最理想的燃料,所以本题答案为:H2;(2)厨房清洁剂中含有的碱为氢氧化钠,所以本题答案为:NaOH(3)由所学知识可知,汽水中含有的不稳定酸是碳酸,所以本...