A:反应速率:乙>甲
B:平衡时C的体积分数:乙>甲
C:平衡时C的转化率:乙>甲
D:平衡时A的物质的量:甲>乙
- Do you know the boy in blue?
- Yes. I ________ him several times since last month.
已知等差数列{an}中,a2=6,a5=15,若bn=a2n,则数列bn的前5项和等于( )