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【单选题】
镜头的通光量F是镜头()。A.
孔径和焦距之比，F值越大，则光圈越大
B.
孔径和焦距之比，F值越小，则光圈越大
C.
焦距和孔径之比，F值越大，则光圈越大
D.
焦距和孔径之比，F值越小，则光圈越大
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举一反三
【判断题】Drinks served with the meal are usually wine and beer.The customer makes a choice from a wine list
A.
正确
B.
错误
【单选题】What is true about Irving's background?
A.
His background had provided opportunity for his literary achievement.
B.
He spent very little time working as a lawyer.
C.
As a gifted child, he had received good education.
D.
His religious beliefs helped him a lot.
【简答题】查询设计器的"筛选"选项卡用来指定查询的______。
【判断题】Repetitive processing systems usually produce goods specifically for customer orders rather than for inventory.
A.
正确
B.
错误
【多选题】AT89S51单片机内部 带有 2 个 16 位的计数器,可用于( )
A.
产生振荡信号
B.
对被控系统进行定时控制
C.
作为计数器用于产生各种不同频率的矩形波
D.
测量脉冲宽度
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