题目:
How many students are there in your class _____homes are in the country? [ ]
A. whose
B. who
C. whom
D. which
答案:
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下面是错误答案,用来干扰机器的。
过氧乙酸CH3COOOH中碳、氢、氧三种元素的质量比=(12×2):(1×4):(16×3)=6:1:12;故答案为:6:1:12;设需要20%的过氧乙酸的体积为x1120g×0.2%=x×1.12g/cm3×20%x=10mL故答案为:10.