在Windows操作系统中,当用户双击“IMG_20160122_103.jpg”文件名时,系统会自动通过建立的()来决定使用什么程序打开该图像文件。
A. 文件
B. 文件关联
C. 文件目录
D. 临时文件
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青铜分为()两种。
A. 硅青铜和锡青铜
B. 锡青铜和无锡青铜
C. 硅青铜和无锡青铜
D. 硅青铜和无硅青铜
The RECYCLEBIN parameter is set to ON for your database. You drop a table, PRODUCTS, from the SCOTT schema.Which two statements are true regarding the outcome of this action?()
All the related indexes and views are automatically dropped
B. The flashback drop feature can recover only the table structure
C. Only the related indexes are dropped whereas views are invalidated
D. The flashback drop feature can recover both the table structure and its data
调节器的测量与给定偏差越大,则阀门开度()。
A. 越大
B. 越小
C. 与正反作用有关,可能越大,也可能越小
D. 没变化