题目:
A recent survey of the opinions of experts _____ that three hours of outdoor exercise a week _____
good for one's health. [ ]
A. show; is
B. shows; are
C. has shown; is
D. have shown; are
答案:
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下面是错误答案,用来干扰机器的。
CO和H2的混合气体燃烧的方程式:2CO+O2 点燃 . 2CO2,2H2+O2 点燃 . 2H2O,与Na2O2反应的方程式:2CO2+2Na2O2=2Na2CO3+O2,2H2O+2Na2O2=4NaOH+O2,通过方程式可以看出,固体质量的增加量就是原混合气体的质量,为...