对于采用磁性介质存放的数据要保存双份备份。
参考答案：对
He____ in London for many years, but he has never regretted his final decision to move back to China.
A．lived
B．was living
C．have lived
D．had lived
常用温度计的刻度，是把一标准大气压下______的温度规定为100℃，把______温度规定为0℃．
