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【简答题】
一条排水管的截面如图所示．已知排水管的截面圆半径OB=10，截面圆圆心O到水面的距离OC是6，则水面宽AB是______．
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参考答案：
举一反三
【单选题】下列各溶液中，Na + 浓度最大的是（　　）
A.
0.8L0.4mol/L的NaOH溶液
B.
0.1L0.5mol/L的NaCl溶液
C.
1L0.3mol/L的NaCl溶液
D.
0.2L0.15mol/L的Na 3 PO 4
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【单选题】下列溶液中Cl - 浓度最大的是（　　）
A.
1L0.1mol?L -1 的KCl溶液
B.
0.2L0.1mol?L -1 的盐酸溶液
C.
0.1L0.1mol?L -1 的AlCl 3 溶液
D.
0.3L0.1mol?L -1 的MgCl 2 溶液
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【单选题】As shown in the figure, the lengths of the cantilever beam and the simply supported beam are the same. For the Fs diagrams and M diagrams of the two beams, which of the following statements is true?
A.
Both Fs and M diagrams of the two beams are the same.
B.
Both Fs and M diagrams of the two beams are different.
C.
Fs diagrams of the two are the same, M diagrams are different.
D.
Fs diagrams of the two are different, M diagrams are the same.
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【简答题】(10分)读图，完成下列问题。 我国主要旅游景点分布 (1)将图中地理事物和现象及其所属的景观分类名称的代号填入表中相应的空格内。 ① 长江三峡　②北京香山红叶　③拉萨布达拉宫　④黄山云海　⑤藏族晒佛节　⑥日月潭 自然景观 人文景观 地文景观 气象气候景观 水域风光景观 生物景观 遗址遗迹 人文活动 (2)桂林山水在吸引旅游者方面起最主要作用的是它的________价值，而北京故宫具有游览价值主要...
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【单选题】下列哪一项不是吸烟对慢性支气管炎发生的影响
A.
副交感神经兴奋增加，使支气管收缩痉挛
B.
呼吸道黏膜上皮细胞纤毛运动受抑制
C.
通过反射引起支气管平滑肌收缩，黏膜血液循环障碍和分泌物排出困难
D.
支气管杯状细胞增生，黏膜分泌增多，使气道净化能力减弱
E.
支气管黏膜充血、水肿、黏液积聚，肺泡中的吞噬细胞功能减弱，易引起感染
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【单选题】In a Young’s experiment, it is essential that the two beams
A.
have exactly equal intensity
B.
be exactly parallel
C.
travel equal distances
D.
come originally from the same source
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【单选题】Knowing that both the bending stiffness EI and the exerted loads of the two beams in the shown figures are the same. Which of the following statements is correct?
A.
The internal forces and displacements of the corresponding points of the two beams are the same.
B.
The internal forces and displacements of the corresponding points of the two beams are different.
C.
The internal forces of the corresponding points of the two beams are the same, while displacements are different.
D.
The internal forces of the corresponding points of the two beams are different, while displacements are the same.
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【单选题】下列水溶液凝固点最高的为( )。
A.
0.1mol.L-1HAc
B.
0.1mol.L-1CaCl2
C.
0.1mol.L-1NaCl
D.
0.1mol.L-1葡萄糖
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【单选题】You ______ your own sandwiches. I have enough for two.
A.
couldn't have brought
B.
mustn't have brought
C.
shouldn' t have brought
D.
needn' t have brought
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【单选题】You ______ your own sandwiches. I have enough for two.
A.
couldn't have brought
B.
shouldn't have brought
C.
mustn't have brought
D.
needn't have brought
查看完整题目与答案
相关题目：
【单选题】下列各溶液中，Na + 浓度最大的是（　　）
A.
0.8L0.4mol/L的NaOH溶液
B.
0.1L0.5mol/L的NaCl溶液
C.
1L0.3mol/L的NaCl溶液
D.
0.2L0.15mol/L的Na 3 PO 4
查看完整题目与答案
【单选题】下列溶液中Cl - 浓度最大的是（　　）
A.
1L0.1mol?L -1 的KCl溶液
B.
0.2L0.1mol?L -1 的盐酸溶液
C.
0.1L0.1mol?L -1 的AlCl 3 溶液
D.
0.3L0.1mol?L -1 的MgCl 2 溶液
查看完整题目与答案
【单选题】As shown in the figure, the lengths of the cantilever beam and the simply supported beam are the same. For the Fs diagrams and M diagrams of the two beams, which of the following statements is true?
A.
Both Fs and M diagrams of the two beams are the same.
B.
Both Fs and M diagrams of the two beams are different.
C.
Fs diagrams of the two are the same, M diagrams are different.
D.
Fs diagrams of the two are different, M diagrams are the same.
查看完整题目与答案
【简答题】(10分)读图，完成下列问题。 我国主要旅游景点分布 (1)将图中地理事物和现象及其所属的景观分类名称的代号填入表中相应的空格内。 ① 长江三峡　②北京香山红叶　③拉萨布达拉宫　④黄山云海　⑤藏族晒佛节　⑥日月潭 自然景观 人文景观 地文景观 气象气候景观 水域风光景观 生物景观 遗址遗迹 人文活动 (2)桂林山水在吸引旅游者方面起最主要作用的是它的________价值，而北京故宫具有游览价值主要...
查看完整题目与答案
【单选题】下列哪一项不是吸烟对慢性支气管炎发生的影响
A.
副交感神经兴奋增加，使支气管收缩痉挛
B.
呼吸道黏膜上皮细胞纤毛运动受抑制
C.
通过反射引起支气管平滑肌收缩，黏膜血液循环障碍和分泌物排出困难
D.
支气管杯状细胞增生，黏膜分泌增多，使气道净化能力减弱
E.
支气管黏膜充血、水肿、黏液积聚，肺泡中的吞噬细胞功能减弱，易引起感染
查看完整题目与答案
【单选题】In a Young’s experiment, it is essential that the two beams
A.
have exactly equal intensity
B.
be exactly parallel
C.
travel equal distances
D.
come originally from the same source
查看完整题目与答案
【单选题】Knowing that both the bending stiffness EI and the exerted loads of the two beams in the shown figures are the same. Which of the following statements is correct?
A.
The internal forces and displacements of the corresponding points of the two beams are the same.
B.
The internal forces and displacements of the corresponding points of the two beams are different.
C.
The internal forces of the corresponding points of the two beams are the same, while displacements are different.
D.
The internal forces of the corresponding points of the two beams are different, while displacements are the same.
查看完整题目与答案
【单选题】下列水溶液凝固点最高的为( )。
A.
0.1mol.L-1HAc
B.
0.1mol.L-1CaCl2
C.
0.1mol.L-1NaCl
D.
0.1mol.L-1葡萄糖
查看完整题目与答案
【单选题】You ______ your own sandwiches. I have enough for two.
A.
couldn't have brought
B.
mustn't have brought
C.
shouldn' t have brought
D.
needn' t have brought
查看完整题目与答案
【单选题】You ______ your own sandwiches. I have enough for two.
A.
couldn't have brought
B.
shouldn't have brought
C.
mustn't have brought
D.
needn't have brought
查看完整题目与答案
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