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【多选题】
在石墨炉原子吸收分析中,扣除背景干扰,应采取的措施有()。
A.
用邻近非吸收线扣除
B.
用氘灯校正背景
C.
用自吸收方法校正背景
D.
效应校正背景
E.
加入保护剂或释放剂
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参考答案:
举一反三
【简答题】能引起人体发生反应的各种环境变化,统称为
【单选题】美国在战略和外交上,没有:
A.
重返亚洲
B.
军事革命
C.
全球部署
D.
B和C
【简答题】请简述isArray方法的使用方式并且举例
【判断题】金属的导热系数大都随其纯度的增加而增大,随其温度的升高而减小
A.
正确
B.
错误
【简答题】金属的导热系数大都随其纯度的增加增加,随其温度的升高而() 。
【单选题】听力原文:W: Hello, everyone. Welcome again to Consumer's Choice, which is the last program in our present series, isn't that right? M: Yes, that's right. The story of how a listener's determination has qu...
A.
To be a keen photographer is too costly.
B.
She has to develop 10 rolls of films.
C.
All her films were vanished.
D.
After the trip, she was too tired to choose a good one.
【单选题】听力原文:W: Hello, everyone. Welcome again to Consumer's Choice, which is the last program in our present series, isn't that right? M: Yes, that's right. The story of how a listener's determination has qu...
A.
To be a keen photographer is too costly.
B.
She has to develop 10 rolls of films.
C.
All her films were vanished.
D.
After the trip, she was too tired to choose a good one.
【单选题】金属的导热系数大都随其纯度的增加而()。
A.
减小
B.
增大
【简答题】金属的导热系数大都随其纯度的增加而______,随其温度升高而______。
【简答题】The last program in the science series, I mean, the Origin of Life, really arouses the curiosity of me.
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