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皮皮学刷刷变学霸
举一反三
【判断题】震荡是二阶系统的唯一典型动态。
A.
正确
B.
错误
【单选题】采用了哪种设计手法?
A.
重复
B.
对比
C.
重叠
D.
对称
【单选题】In this passage, how is the discussion of optimism and pessimism developed?
A.
By time sequence.
B.
By comparison and contrast.
C.
By cause and effect.
D.
By definition.
【多选题】关于镉的测定,说法正确的是( )
A.
镉的测定方法包括火焰原子吸收光谱法,电感耦合等离子体发射光谱法,双硫腙分光光度法,阳极溶出伏安法等
B.
水样通常用硝酸会硝酸--高氯酸进行预处理
C.
镉的测定,其定量的方法只有标准曲线法
D.
当水样环境基体复杂时,常选用石墨炉原子吸收光谱法测定。
【多选题】关于电感耦合等离子体发射光谱法说法正确的是
A.
可进行多元素的同时测定
B.
以等离子体为激发光源的原子发射光谱分析方法
C.
根据特征谱线的存在与否,鉴别样品中是否含有某种元素
D.
根据特征谱线强度确定样品中相应元素的含量
【单选题】How many renters maily talked in this passage?
A.
2
B.
3
C.
4
D.
5
【单选题】How many people are mentioned in this passage?
A.
4
B.
5
【单选题】How many examples are cited in this passage to illustrate that the emotions are associated with illness?
A.
4
B.
5
C.
6
D.
7
【单选题】What does the author mainly discuss in this passage?
A.
How to avoid car crash.
B.
How to educate children properly.
C.
How to design safer baby equipment.
D.
How to properly secure children in the car.
【单选题】How many factors are mentioned in this passage influencing the Canadian economic contraction?
A.
Six.
B.
Seven.
C.
Eight.
D.
Nine.
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