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【判断题】
若 a 是 int 型变量,则表达式( a=4*5,a*2 ) ,a+6 的值为 20。
A.
正确
B.
错误
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【简答题】绝缘栅双极型晶体管具有速度快、 ( ) 阻抗高,通态电压低、耐压高、电容量大的特点。
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【单选题】trace elements( )。
A.
关键元素
B.
元素
C.
追踪
D.
微量元素
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【单选题】“不可曲止也”中的“曲”意思是( ) C
A.
弯曲
B.
插曲
C.
详尽
D.
迂回
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【多选题】Write down the approaches of determination of trace elements in environmental sample. What are their limitations? How to reduce or eliminate these problems?
A.
The main analytical techniques used for determination of trace elements in environmental samples include:
B.
Atomic absorption spectrometry (flame or electrothermal) (AAS, ET-AAS), atomic fluorescence spectrometry (AFS), inductively coupled plasma optical (or atomic) emission spectrometry (ICP-OES or ICP-AES), neutron activation analysis (NAA), X-ray fluorescence (XRF), proton-induced X-ray emission (PIXE), spark source or isotope dilution mass spectrometry (SSMS, IDMS), electrochemical (anodic stripping voltammetry and polarography) or inductively coupled plasma-mass spectrometry (ICP-MS).
C.
The main limitations for most of these analytical methods are sensitivity or precision problems due to interferences and sample matrix effects.
D.
In some cases these problems have been reduced or eliminated by the use of pre-analysis separation schemes, matrix-matching of reagent blanks, calibration standards and samples; the inclusion of instrument background correction (AAS) or the coupling of hydride generation (HG), electro thermal vaporization (ETV), cold vapor (CV), flow injection (FI), ultrasonic nebulisation (USN) or laser ablation (LA) devices to the trace element detector.
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【判断题】Trace elements and vitamins are not necessary for the growth of bacteria.
A.
正确
B.
错误
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【简答题】案例1:甲与乙有线电视台签订有线电视收视服务合同,按时交纳了收视、维护费。电视台播放《还珠格格》时,插播大量广告。据此,甲向法院起诉,要求电视台停止插播商业广告,并赔偿其在收看《还珠格格》剧期间受到侵害的费用每集20元,共960元。电视台辩称,其不存在合同违约,侵权亦不能成立,不同意甲的请求。 试问乙电视台的行为是否构成侵权行为?
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【判断题】Trace elements are essential to life.
A.
正确
B.
错误
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【判断题】电位上升会降低阳极方向电化学反应的活化能 ( )
A.
正确
B.
错误
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【判断题】Trace elements are required over one gm.
A.
正确
B.
错误
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【单选题】__________________has rich trace elements and vitamin. It helps to prevent and treat disease.
A.
Sugar and milk
B.
Fruits and vegetables
C.
Coffee and coco
查看完整题目与答案
相关题目：
【简答题】绝缘栅双极型晶体管具有速度快、 ( ) 阻抗高,通态电压低、耐压高、电容量大的特点。
查看完整题目与答案
【单选题】trace elements( )。
A.
关键元素
B.
元素
C.
追踪
D.
微量元素
查看完整题目与答案
【单选题】“不可曲止也”中的“曲”意思是( ) C
A.
弯曲
B.
插曲
C.
详尽
D.
迂回
查看完整题目与答案
【多选题】Write down the approaches of determination of trace elements in environmental sample. What are their limitations? How to reduce or eliminate these problems?
A.
The main analytical techniques used for determination of trace elements in environmental samples include:
B.
Atomic absorption spectrometry (flame or electrothermal) (AAS, ET-AAS), atomic fluorescence spectrometry (AFS), inductively coupled plasma optical (or atomic) emission spectrometry (ICP-OES or ICP-AES), neutron activation analysis (NAA), X-ray fluorescence (XRF), proton-induced X-ray emission (PIXE), spark source or isotope dilution mass spectrometry (SSMS, IDMS), electrochemical (anodic stripping voltammetry and polarography) or inductively coupled plasma-mass spectrometry (ICP-MS).
C.
The main limitations for most of these analytical methods are sensitivity or precision problems due to interferences and sample matrix effects.
D.
In some cases these problems have been reduced or eliminated by the use of pre-analysis separation schemes, matrix-matching of reagent blanks, calibration standards and samples; the inclusion of instrument background correction (AAS) or the coupling of hydride generation (HG), electro thermal vaporization (ETV), cold vapor (CV), flow injection (FI), ultrasonic nebulisation (USN) or laser ablation (LA) devices to the trace element detector.
查看完整题目与答案
【判断题】Trace elements and vitamins are not necessary for the growth of bacteria.
A.
正确
B.
错误
查看完整题目与答案
【简答题】案例1:甲与乙有线电视台签订有线电视收视服务合同,按时交纳了收视、维护费。电视台播放《还珠格格》时,插播大量广告。据此,甲向法院起诉,要求电视台停止插播商业广告,并赔偿其在收看《还珠格格》剧期间受到侵害的费用每集20元,共960元。电视台辩称,其不存在合同违约,侵权亦不能成立,不同意甲的请求。 试问乙电视台的行为是否构成侵权行为?
查看完整题目与答案
【判断题】Trace elements are essential to life.
A.
正确
B.
错误
查看完整题目与答案
【判断题】电位上升会降低阳极方向电化学反应的活化能 ( )
A.
正确
B.
错误
查看完整题目与答案
【判断题】Trace elements are required over one gm.
A.
正确
B.
错误
查看完整题目与答案
【单选题】__________________has rich trace elements and vitamin. It helps to prevent and treat disease.
A.
Sugar and milk
B.
Fruits and vegetables
C.
Coffee and coco
查看完整题目与答案