A:杂草、生产者
B:害虫、消费者
C:人、管理者
D:农作物,生产者
- Are all the students from in your class?
- No, there are only 3 in our class. The others are from other countries.
等差数列{an}的首项为1,公差不为0.若a2,a3,a6成等比数列,则{an}前6项的和为( )
填上适当的名称
____×____ =工作总量