在非冰冻地区,地下燃气管道埋设在非车行道下时,路面至管顶的最小覆土厚应不得小于()m。
A.0.6
B.0.8
C.1.0
D.1.2
参考答案:A
简述棉花打顶的作用?
Primary memory is stored on chips located (66) . In addition, computers usually use disks as second memory, for example, (67) disks located inside the computer.
A.Flash
B.Hard
C.Floppy
D.Compact