施工中发现影响施工的地下障碍物时，承包人应于( )内以书面形式通知工程师。
A．4小时
B．8小时
C．12小时
D．24小时
参考答案：B
-----Do you know__________________?
-----At the end of July?
A．how soon is your sister coming back home
B．how often Nancy hears from her pen friend
C．when the London Olympic Games will be held
D．when will the new computer game come out
在微机系统中，只读存储器常标记为
A．ROM
B．RAM
C．External Memory
D．Internal Memory
