题目内容

Some enterprises introduced ___________ warehouse which can save time and manpower.

A. automatically
B. automatic
C. automation

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The company has just successfully ___________ a new digital radio transmission system (数字无线电传输系统).

A. demonstrates
B. demonstrating
C. demonstrated

Robots can quickly ___________ to a new circumstance (环境) and fulfil the tasks.

A. adaptive
B. adapt
C. adapting

PN结加适量反向电压时，空间电荷区将（)。

A. 变宽
B. 变窄
C. 不变
D. 消失

PN结最大的特点是。

A. 不导电
B. 单向导电性
C. 双向导电性