A:现金结算和信用卡结算
B:现金结算和转账结算
C:现金结算和实物结算
D:转账结算和外汇结算
若sin(π6-α)=13,则cos(2π3+2α)=( )
54÷6____48÷6 24×4____24÷4
18×2____72÷2 36÷3____90÷5
-- Hello, Tim! What's that?-- It's eraser.