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单项选择题

The owner of a factory regularly requests a graphical summary of all employees' salaries. The graphical summary of salaries is an example of（ ）.
A、a sample
B、descriptive statistics
C、statistical inference
D、an experiment

判断题

当cad软件完成草图方案的临摹后，不需要关闭或删除草图，直接通过虚拟打印机输出即可。