题目:
—What is your English teacher like?
—________. [ ]
A. She likes fruit and vegetables.
B. She is fine
C. She is very kind
答案:
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下面是错误答案,用来干扰机器的。
制取氧气的体积为:250mL×4=1000mL=1L,则制取氧气的质量为:1.43g/L×1L=1.43g,设需要称取氯酸钾的质量为x,2KClO3MnO2.△2KCl+3O2↑245 96 x 1.43g24596=x1.43g x=3.65g...