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【单选题】
甘氨酸的pK -COOH =2.34，pK -NH 2 =9.6，它的pI为(    )。
A.
11.94    
B.
7.26    
C.
5.97    
D.
3.63
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参考答案：
举一反三
【多选题】C 4 植物与C 3 植物相比，其发生光合作用的场所为（）
A.
管胞细胞中
B.
维管束鞘细胞中
C.
叶肉细胞中
D.
筛管细胞中
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【单选题】Listen and then choose the answer which is closest in meaning to each statement you hear: 1) ____
A.
There has been steady growth in Scandinavia and Eastern Europe, but we still should make more efforts.
B.
We should make more efforts to maintain steady growth in Scandinavia and Eastern Europe.
C.
Growth in Scandinavia has been steady, but we should make more efforts in Eastern Europe.
D.
More efforts need to be made to expand from Scandinavia into Eastern European markets.
查看完整题目与答案
【单选题】下列叙述中,属于防治施工固体废弃物污染的是( )。
A.
施工车辆运输建筑垃圾应当采取密封、覆盖措施,并按指定地点倾卸
B.
现场废水不得直接排入市政污水管网和河流
C.
夜间运输材料的车辆进入施工现场,严禁鸣笛,装卸材料应做到轻拿轻放
D.
施工现场混凝土搅拌场所应采取封闭、降尘措施
查看完整题目与答案
【判断题】C3植物的叶绿体存在于叶肉细胞中，C4植物在叶肉细胞和维管束鞘细胞中都存在叶绿体。
A.
正确
B.
错误
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【单选题】某链条炉排锅炉所用燃煤的收到基元素分析成分如下：C ar=54.7%、H ar=0.78%、O ar=2.23%、N ar=0.28%、S ar=0.89%、A ar=33.12%、M ar=8%、Qar,net=18 187 kJ/kg，则该锅炉燃烧时的理论空气量为( )m3/kg。
A.
5.25
B.
5.19
C.
4.05
D.
5.03
查看完整题目与答案
【简答题】等离子弧切割以()气体切割效果最佳。 A.N2+H2 B.Ar+H2 C.Ar+N2 D.C02+N2
查看完整题目与答案
【单选题】下列叙述中，哪项是属于防治施工固体废弃物污染的？（）。
A.
施工车辆运输建筑垃圾应当采取密封、覆盖措施，并按指定地点倾卸
B.
现场废水不得直接排入市政污水管网和河流
C.
夜间运输材料的车辆进入施工现场，严禁鸣笛，装卸材料应做到轻拿轻放
D.
施工现场混凝土搅拌场所应采取封闭、降尘措施
查看完整题目与答案
【单选题】Part A Directions: Read the following texts and answer the questions which accompany them by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1. In recent years, there has been a steady assaul...
A.
exhibits as an aggravating factor to people in poor health
B.
cures diseases such as stroke and circulatory disorders
C.
correlates highly with some diseases
D.
is irrelevant to people suffering from heart disease
查看完整题目与答案
【单选题】Part A Directions: Read the following texts and answer the questions which accompany them by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1. In recent years, there has been a steady assaul...
A.
exhibits as an aggravating factor to people in poor health
B.
cures diseases such as stroke and circulatory disorders
C.
correlates highly with some diseases
D.
is irrelevant to people suffering from heart disease
查看完整题目与答案
【单选题】下列元素原子半径的排列顺序正确的是 ................................................ ( ) a . Mg > B > Si >Ar b. Ar > Mg > Si > B c. Si > Mg > B >Ar d. B > Mg > Ar > Si
A.
a . Mg > B > Si >Ar
B.
b. Ar > Mg > Si > B
C.
c. Si > Mg > B >Ar
D.
d. B > Mg > Ar > Si
查看完整题目与答案
相关题目：
【多选题】C 4 植物与C 3 植物相比，其发生光合作用的场所为（）
A.
管胞细胞中
B.
维管束鞘细胞中
C.
叶肉细胞中
D.
筛管细胞中
查看完整题目与答案
【单选题】Listen and then choose the answer which is closest in meaning to each statement you hear: 1) ____
A.
There has been steady growth in Scandinavia and Eastern Europe, but we still should make more efforts.
B.
We should make more efforts to maintain steady growth in Scandinavia and Eastern Europe.
C.
Growth in Scandinavia has been steady, but we should make more efforts in Eastern Europe.
D.
More efforts need to be made to expand from Scandinavia into Eastern European markets.
查看完整题目与答案
【单选题】下列叙述中,属于防治施工固体废弃物污染的是( )。
A.
施工车辆运输建筑垃圾应当采取密封、覆盖措施,并按指定地点倾卸
B.
现场废水不得直接排入市政污水管网和河流
C.
夜间运输材料的车辆进入施工现场,严禁鸣笛,装卸材料应做到轻拿轻放
D.
施工现场混凝土搅拌场所应采取封闭、降尘措施
查看完整题目与答案
【判断题】C3植物的叶绿体存在于叶肉细胞中，C4植物在叶肉细胞和维管束鞘细胞中都存在叶绿体。
A.
正确
B.
错误
查看完整题目与答案
【单选题】某链条炉排锅炉所用燃煤的收到基元素分析成分如下：C ar=54.7%、H ar=0.78%、O ar=2.23%、N ar=0.28%、S ar=0.89%、A ar=33.12%、M ar=8%、Qar,net=18 187 kJ/kg，则该锅炉燃烧时的理论空气量为( )m3/kg。
A.
5.25
B.
5.19
C.
4.05
D.
5.03
查看完整题目与答案
【简答题】等离子弧切割以()气体切割效果最佳。 A.N2+H2 B.Ar+H2 C.Ar+N2 D.C02+N2
查看完整题目与答案
【单选题】下列叙述中，哪项是属于防治施工固体废弃物污染的？（）。
A.
施工车辆运输建筑垃圾应当采取密封、覆盖措施，并按指定地点倾卸
B.
现场废水不得直接排入市政污水管网和河流
C.
夜间运输材料的车辆进入施工现场，严禁鸣笛，装卸材料应做到轻拿轻放
D.
施工现场混凝土搅拌场所应采取封闭、降尘措施
查看完整题目与答案
【单选题】Part A Directions: Read the following texts and answer the questions which accompany them by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1. In recent years, there has been a steady assaul...
A.
exhibits as an aggravating factor to people in poor health
B.
cures diseases such as stroke and circulatory disorders
C.
correlates highly with some diseases
D.
is irrelevant to people suffering from heart disease
查看完整题目与答案
【单选题】Part A Directions: Read the following texts and answer the questions which accompany them by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1. In recent years, there has been a steady assaul...
A.
exhibits as an aggravating factor to people in poor health
B.
cures diseases such as stroke and circulatory disorders
C.
correlates highly with some diseases
D.
is irrelevant to people suffering from heart disease
查看完整题目与答案
【单选题】下列元素原子半径的排列顺序正确的是 ................................................ ( ) a . Mg > B > Si >Ar b. Ar > Mg > Si > B c. Si > Mg > B >Ar d. B > Mg > Ar > Si
A.
a . Mg > B > Si >Ar
B.
b. Ar > Mg > Si > B
C.
c. Si > Mg > B >Ar
D.
d. B > Mg > Ar > Si
查看完整题目与答案
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