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【单选题】
SQL Server把数据及其相关信息用多个逻辑组件来表示,这些逻辑组件通常被称为数据库对象。以下()不是数据库对象。
A.
表
B.
视图
C.
索引
D.
备份
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【单选题】If solutions of calcium iodide and ammonium chloride are mixed together in a metathesis reaction, what is the empirical formula for the precipitate which forms ?
A.
CaCl 2
B.
CaCl
C.
NH 4 Cl
D.
No precipitate forms
E.
A mixture of NH 4 Cl and CaCl 2 forms
查看完整题目与答案
【简答题】What volume of 0.1mol/L hydrochloric acid solution should be added to 50 mLof the following solutions respectively to prepare solution at pH =7.00? (1) 0.1mol/L NaOH solution. (2) 0.1 mol/L NH3 soluti...
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【简答题】计算下列波形的幅度和频率 ( 经探头接入 ) : ( 1 ) V / div 位于 0.2 档, t / div 位于 2 μ s 档。 1 H = 2div , D = 3div 2 H = 5div , D = 2div . 3 H = 3div , D = 5div ( 2 ) V / div 位于 0.05 档, t / div 位于 50 μ s 档。 1 H = 5div , D = ...
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【单选题】Which of the following solutions has the highest pH?
A.
0.40M NaOH
B.
0.40M Ba(OH) 2
C.
0.40M NH 3 .H 2 O
D.
0.40M NaCl
查看完整题目与答案
【简答题】计算下列波形的幅度和频率 ( 经探头接入 ) : ( 1 ) V / div 位于 0.2 档, t / div 位于 2 μ s 档。 1 H = 2div , D = 3div 2 H = 5div , D = 2div . 3 H = 3div , D = 5div
查看完整题目与答案
【单选题】The lower the spreading factor, the more payload data a signal can convey on the radio interface.
A.
convert
B.
transmit
C.
transform
D.
generate
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【单选题】The solutions of NH 4 Ac is
A.
acidic
B.
basic
C.
neutral
D.
unknown
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【单选题】按CIF TIANJIN成交的合同，卖方完成交货任务是在(    )。
A.
装运港    
B.
目的港
C.
TIANJIN港    
D.
TIANJIN市内
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【单选题】She has been in Tianjin for ten years. Tianjin has become her second _________.
A.
family
B.
house
C.
home
D.
room
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【单选题】If the following solutions are at the same concentration of 0.1 mol · L -1 , which is the correct ordering of their pH value? ( Ka( HAC )=1.75 × 10 -5 , Ka( HF )=6.8 × 10 -4 , Ka( HCN )=6.2 × 10 -10 )
A.
NaCN >NaAc>NaF>NaCl>NH 4 Cl
B.
NaF>NaAc>NaCN> NaCl>NH 4 Cl
C.
NaAc>NaCN>NaF>NaCl>NH 4 Cl
D.
NH 4 Cl>NaCl>NaF>NaAc>NaCN
查看完整题目与答案
相关题目：
【单选题】If solutions of calcium iodide and ammonium chloride are mixed together in a metathesis reaction, what is the empirical formula for the precipitate which forms ?
A.
CaCl 2
B.
CaCl
C.
NH 4 Cl
D.
No precipitate forms
E.
A mixture of NH 4 Cl and CaCl 2 forms
查看完整题目与答案
【简答题】What volume of 0.1mol/L hydrochloric acid solution should be added to 50 mLof the following solutions respectively to prepare solution at pH =7.00? (1) 0.1mol/L NaOH solution. (2) 0.1 mol/L NH3 soluti...
查看完整题目与答案
【简答题】计算下列波形的幅度和频率 ( 经探头接入 ) : ( 1 ) V / div 位于 0.2 档, t / div 位于 2 μ s 档。 1 H = 2div , D = 3div 2 H = 5div , D = 2div . 3 H = 3div , D = 5div ( 2 ) V / div 位于 0.05 档, t / div 位于 50 μ s 档。 1 H = 5div , D = ...
查看完整题目与答案
【单选题】Which of the following solutions has the highest pH?
A.
0.40M NaOH
B.
0.40M Ba(OH) 2
C.
0.40M NH 3 .H 2 O
D.
0.40M NaCl
查看完整题目与答案
【简答题】计算下列波形的幅度和频率 ( 经探头接入 ) : ( 1 ) V / div 位于 0.2 档, t / div 位于 2 μ s 档。 1 H = 2div , D = 3div 2 H = 5div , D = 2div . 3 H = 3div , D = 5div
查看完整题目与答案
【单选题】The lower the spreading factor, the more payload data a signal can convey on the radio interface.
A.
convert
B.
transmit
C.
transform
D.
generate
查看完整题目与答案
【单选题】The solutions of NH 4 Ac is
A.
acidic
B.
basic
C.
neutral
D.
unknown
查看完整题目与答案
【单选题】按CIF TIANJIN成交的合同，卖方完成交货任务是在(    )。
A.
装运港    
B.
目的港
C.
TIANJIN港    
D.
TIANJIN市内
查看完整题目与答案
【单选题】She has been in Tianjin for ten years. Tianjin has become her second _________.
A.
family
B.
house
C.
home
D.
room
查看完整题目与答案
【单选题】If the following solutions are at the same concentration of 0.1 mol · L -1 , which is the correct ordering of their pH value? ( Ka( HAC )=1.75 × 10 -5 , Ka( HF )=6.8 × 10 -4 , Ka( HCN )=6.2 × 10 -10 )
A.
NaCN >NaAc>NaF>NaCl>NH 4 Cl
B.
NaF>NaAc>NaCN> NaCl>NH 4 Cl
C.
NaAc>NaCN>NaF>NaCl>NH 4 Cl
D.
NH 4 Cl>NaCl>NaF>NaAc>NaCN
查看完整题目与答案