问题
选择题
由H2、CH4、CO组成的混合物的混合气体a mL，完全燃烧时消耗相同条件下O2的体积也为a mL，则原混合气中CH4的体积分数为 [ ]
A．1/3
B．2/3
C．1/2
D．3/5
答案
答案：A
搜题请搜索小程序“爱下问搜题”
由H2、CH4、CO组成的混合物的混合气体a mL，完全燃烧时消耗相同条件下O2的体积也为a mL，则原混合气中CH4的体积分数为 [ ]
A．1/3
B．2/3
C．1/2
D．3/5
答案：A
I asked children about their TV watching habits in three different groups---from four to six , from seven to twelve and from thirteen to sixteen. The children in the first group watch TV for an average of two hours in the day and an average of one hour at night. The children in the second group watch it for an average of two and a half hours at night. The children in the third group watch it for an average of one and a half hours at night. Cartoons are the favorite shows of the first group. The favorite shows of the second group are TV plays and the favorite shows of the third group are quiz programme.
小题5:__________________________________________________________________ |