连续磁盘空间分配策略的优点是( )。
A．产生的磁盘碎片少
B．存取速度快
C．文件长，不受限制
D．支持对文件块的直接访问
参考答案：B
The old man said the accident ________careless driving，so a lot of money ________be paid by the driver.
A．was due to；was due to
B．due to；was due to
C．is due to；has due to
D．is due to；was due to
目前工程上所采用的基本换流单元有（）脉动换流单元和（）脉动换流单元两种。
A.6
B.8
C.12
D.16
