外存储器在计算机中通常是指磁盘存储器。( )
参考答案：错
解析： 外存储器在计算机中通常是指软盘、硬盘、光盘、磁带存储器。
He tried his best to solve the problem, _______ difficult it was.
A．whatever
B．however
C．whichever
D．wherever
列车进路分哪几种？
