A:“反清复明”
B:“扶清灭洋”
C:“除暴安良”
D:“还我河山”
0.09的计数单位是____,它有____个这样的计数单位,0.50的计数单位是____。
已知函数f(x)=sinx﹣cosx,则f(π12)=____
They didn't put up the signs after school, ___________.