∵(±3)2=9,
92=81,
∴a=81
故填81.
以下不是以详细话单的形式保存的是:()。
A.免费话单
B.申告话单
C.统计话单
D.告警话单
After May Day, I wrote down whatever _____ me during the journey,
especially the little girl who couldn’t go to school for being disabled.[ ]
A. expressed
B. effected
C. impressed
D. influenced