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【简答题】
人类生活离不开金属。在研究“铁生锈的条件”的实验中,某兴趣小组对实验进行了创新设计,请把实验报告补充完整. 【实验目的】铁生锈条件的探究. 【实验内容】取 3 无锈的细铁丝,绕成螺旋状,放入 3 支干燥洁净的试管底部,进行下列实验,实验要保证有足够长的时间来观察现 象. 【实验现象】实验 1和2中无明显现象,实验3中铁丝生锈,且试管内空气体积减小. 【实验结论】铁生锈实际上是铁与空气中的 ______ (填名称)发生反应的结果. 【实验思考】 ( 1 )当铁丝足量,时间足够长,实验 3中进入试管内的水的体积约占试管剩余容积的 ______ . ( 2 )该实验创新之处在于:可根据铁丝表面的铁锈和 __ _ __ _ 两种现象来判断铁丝反应进行的情况. ( 3 )切完咸菜的菜刀未经处理直接存放,菜刀很快就生锈了,原因是 ______ . ( 4)应用金属活动性顺序能帮助我们进一步学习金属性质。 已知下列各组物质间均能发生置换反应。 A .Fe 和 CuSO 4 溶液 B .Mg 和 MnSO 4 溶液 C .Mn 和 FeSO 4 溶液 1写出 Fe 和 CuSO 4 溶液反应的化学方程式 。 2 Mn 、 Fe 、 Mg 、 Cu 四种 金属的活动性由强到弱的顺序 。
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【单选题】Senility refers to great losses of intellectual capacity that occurs in old age and is associated with the widespread loss of nerve cells and the shrinkage of brain tissue. Senility is a great decline...
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extent
C.
scope
D.
criterion
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【单选题】二阶系统的标准传递函数为( )
A.
ω n /(S 2 +2ξω n S+1) （ ξ=1）
B.
ω n /(S 2 +2ξω n S+1) (0
C.
1/[S（TS+1）]
D.
T 2 /（T 2 S 2 +2ξTS+1） (0
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【简答题】A．All professional athletes. B．All stars. C．A few stars. D．International tennis stars.
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【单选题】The national flag of the United States is called 'the Stars and Stripes', with______ stars and______horizontal stripes on it.
A.
51, 12
B.
50, 13
C.
51, 15
D.
50, 12
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【单选题】As a result of the severe earthquake in Wenchuan, the whole city _____ great losses. [     ]
A.
have suffered from
B.
suffered
C.
have suffered
D.
suffered from
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【单选题】Senility refers to great losses of intellectual capacity that occurs in old age and is associated with the widespread loss of nerve cells and the shrinkage of brain tissue. Senility is a great decline...
A.
level
B.
extent
C.
scope
D.
criterion
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【单选题】40 kilometers _____ Chengdu lies a town, _____ suffered great losses in the earthquake, but is now on the road to recovering.
A.
west of; which
B.
on the west in; where
C.
west of; where
D.
on the west of; which
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【单选题】The 50 stars in the national flag of America represent 50 .
A.
cities
B.
famous presidents
C.
states
D.
senate members
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【单选题】The 50 stars on the Americas national flag represent its 50
A.
current states.
B.
nations.
C.
colonial states.
D.
cities.
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【多选题】Why does the American flag have 50 stars?
A.
Because there is one star for each state
B.
Because there are 50 cities in America
C.
Because each star represents a state
D.
Because there are 50 states in America
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相关题目：
【单选题】Senility refers to great losses of intellectual capacity that occurs in old age and is associated with the widespread loss of nerve cells and the shrinkage of brain tissue. Senility is a great decline...
A.
level
B.
extent
C.
scope
D.
criterion
查看完整题目与答案
【单选题】二阶系统的标准传递函数为( )
A.
ω n /(S 2 +2ξω n S+1) （ ξ=1）
B.
ω n /(S 2 +2ξω n S+1) (0
C.
1/[S（TS+1）]
D.
T 2 /（T 2 S 2 +2ξTS+1） (0
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【简答题】A．All professional athletes. B．All stars. C．A few stars. D．International tennis stars.
查看完整题目与答案
【单选题】The national flag of the United States is called 'the Stars and Stripes', with______ stars and______horizontal stripes on it.
A.
51, 12
B.
50, 13
C.
51, 15
D.
50, 12
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【单选题】As a result of the severe earthquake in Wenchuan, the whole city _____ great losses. [     ]
A.
have suffered from
B.
suffered
C.
have suffered
D.
suffered from
查看完整题目与答案
【单选题】Senility refers to great losses of intellectual capacity that occurs in old age and is associated with the widespread loss of nerve cells and the shrinkage of brain tissue. Senility is a great decline...
A.
level
B.
extent
C.
scope
D.
criterion
查看完整题目与答案
【单选题】40 kilometers _____ Chengdu lies a town, _____ suffered great losses in the earthquake, but is now on the road to recovering.
A.
west of; which
B.
on the west in; where
C.
west of; where
D.
on the west of; which
查看完整题目与答案
【单选题】The 50 stars in the national flag of America represent 50 .
A.
cities
B.
famous presidents
C.
states
D.
senate members
查看完整题目与答案
【单选题】The 50 stars on the Americas national flag represent its 50
A.
current states.
B.
nations.
C.
colonial states.
D.
cities.
查看完整题目与答案
【多选题】Why does the American flag have 50 stars?
A.
Because there is one star for each state
B.
Because there are 50 cities in America
C.
Because each star represents a state
D.
Because there are 50 states in America
查看完整题目与答案
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