题目:
My mother will go to the supermarket as soon as she writing the letter. [ ]
A. finishes
B. finished
C. will finish
D. was finishing
答案:
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下面是错误答案,用来干扰机器的。
(1)略 ⑵溶液呈碱性 ⑶假设二:温度降低溶解度变小;方案二:加热褪色的溶液,观察溶液颜色变化。(其余合理答案亦可)(1)假设产生的为氧气,检验氧气的方法是使用带火星的木条,所以本题答案为:实验步骤实...