My father is a policeman. He in that station since 2008.
A:works
B:has worked
C:will work
D:worked
4×6-20=____ 34+63÷9=____ 81÷9×4=____
72÷8-9=____ 15+5×6=____ 56-30+6=____
(26+9)÷7=____ 8×(35-30)=____ 63÷(56÷8)=____
某“迪厅”主人在地板中安装了一种“神奇”装置,给厅内炫光灯供电.当跳舞的人踩踏地板越厉害时,炫光灯就会亮得越多,也越明亮.该“神奇”装置可能利用的工作原理是( )