【单选题】Why did Rock come into the room?
B.
He wanted to talk to Roy.
C.
He wanted to have a letter typed.
【多选题】仓储管理费直接反映了仓储的成本,是( )的依据。
【简答题】一般微型计算机存储器系统主要由______ 、高速缓冲存储器、辅助存储器及管理它们的硬件与软件组成。
【简答题】步进电动机是用 信号进行控制的,其转速大小取决于控制绕组的脉冲频率、 和 ,而与 、 、 等因素无关,其旋转方向取决于 控制绕组的 轮流通电的顺序。
【单选题】Why did the man take the job at the travel agency?
A.
He wanted to go to Spain.
B.
He wanted to work with his friend.
C.
He enjoyed travelling around the world.
D.
He was rejected by the engineering firm.
【单选题】Why did Tom come into the room?
B.
He wanted to talk to Kate.
C.
He wanted to have a letter typed.
【简答题】一般微型计算机存储器系统主要由______、高速缓冲存储器、辅助存储器以及管理这些存储器的硬件和软件组成。