采用()功能可无限地保存所有的历史数据。
参考答案:自动归档
-Have you made ______ apology to your mother?
-Yes. I regretted speaking to her in ______ rude manner.
A.an; a
B.an; /
C.the; a
D./ ; the
用长为20米的铁丝围成一个长方形方框,使长为6.2米,宽为x米,则可列方程为( )
A.x+2×6.2=20
B.x+6.2=20
C.2x+6.2=20
D.2(x+6.2)=20