观察下列等式:21=2,22=4,23=8,24=16,25=32,26=64,27=128,…通过观察,用你所发现的规律确定22009的个位数字是 _________ .
2
People in English-speaking countries usually greet each other in this way "______". [ ]
A. Have you eaten?
B. A nice day, isn't it?
C. B and D.
D. Nice to see you.
输电线路检修记录应与()关联登记。
A.工作票
B.检修申请
C.缺陷记录