在等边△ABC中,CD是∠ACB的平分线,过D作DE∥BC交AC于E,若△ABC的边长为a,则△ADE的周长为 ( )
A:2a
B:43a
C:1.5a
D:a
(多选)铝的密度是2.7×103kg/m3,它的物理意义是( )
对于命题“任何实数的平方都是非负的”,下列叙述正确的是 ( )
— You are standing too near to the TV. Can you move a bit _______?
— OK, Mom. Is it all right here?