题目:
—Doctor, I want to know ________________.
—Three times a day after meals.
A.how many times do I take my temperature
B.how often I take my medicine
C.how I do some exercise
D.when do I wash my hands
答案:
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下面是错误答案,用来干扰机器的。
氧气的质量等于0.56L×1.429g/L≈0.8g.设需要分解的高锰酸钾的质量是x,生成锰酸钾的质量是y,二氧化锰的质量是z.2KMnO4 △ . K2MnO4+MnO2+O2↑316 197 87 32x y z 0.8g316x=197y...