计算机在运行中突然断电，下列存储器中，记录的信息会全部丢失的是( )。
A．ROMB．RAMC．硬盘D．软盘
参考答案：B
— Tom _____ the piano in the room.
— Please ask him to come here. [ ]
A. play
B. plays
C. played
D. is playing
当旅客颈部受伤时，必须限制其头部的活动。（）
