题目内容

可用下列那种方法减小分析测定中的偶然误差?( )

A. 进行对照实验
B. 进行空白实验
C. 增加平行测定实验的次数
D. 进行分析结果校正

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下列叙述中属于系统误差规律的是（）。

A. 确定的原因引起
B. 有一定方向性
C. 重复测定重复出现
D. 大误差出现的概率比小误差的小

提高分析结果准确度的方法有（）

A. 选择恰当的分析方法
B. 减小测量误差
C. 减小偶然误差的影响
D. 消除测量中的系统误差

Activity 2Fill in the blanks with the proper forms of words given in the brackets.1. ___(social) is the foundation on which human societies are based.2. What a _(terrify) experience!3. He took up_(resident) in America.4. QUANJUDE Peking Roast Duck was one of the (theme) restaurants in China since1864.5. It is necessary to overcome _____(shy) at school.

Activity 3Grammar: Fill in the blanks with the proper forms of words given in the brackets.1. They(are) absent from school two days ago.2. I (buy) a gift for my mum yesterday.3. (plant) trees makes our environment better.4. (watch) too much TV does harm to our eyes.5. (not arrive) on time can be a form of avoidance.