单项选择题

若原子吸收的定量方法为标准加入法时，具有的特点有 ( ) 。

A．消除基体干扰
B．不能消除背景吸收
C．加入标准溶液中元素浓度应与试样中被测元素的浓度接近
D．其余都对

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多项选择题

Which of the following statements are true about the relationship between discourses and the actual things that people say or write?

A、The things that people say and write belong to particular discourses.
B、Discourses "show up" in the things that people say and write.
C、The things that people say and write are dependent for their meaning upon the discursive context in which they appear.
D、Discourses and the things that people say and write are the same thing.

单项选择题

塑料排水管应该按设计要求设置伸缩节，如设计图纸没有明确，应该按照规范设置，其间距不得大于（）米。
A、5
B、4
C、3
D、6