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
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.