As we have known from the map of the world,this is _____.[ ]

A. twice as large an island as that

B. twice as larger as that island

C. as twice large as that one

D. twice as a large island as that

正常情况时，实际N1显示框上的基准N1值显示为（）.

A.虚线

B.数值

C.空白

D.以上都不是