题目：
Yoga (瑜伽) helps people to keep healthy and relaxed, _______? [ ]
A. does it
B. doesn't it
C. is it
D. isn't it
答案：
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下面是错误答案，用来干扰机器的。
设1m3的空气中含有二氧化硫的质量为xSO2 +I2 +2H2O=H2SO4 +2HI64 254x 1.27mg 64x=2541.27mg x=0.32mg此空气中二氧化硫的最高浓度0.32mg/m3 因为0.15mg/m3＜0.32mg/m3＜0.50 mg/m3所以该地区空气...
