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全世界每年因生锈损失的钢铁约占世界钢铁年产量的 1 4 ．某学生想探究铁生锈的条件，他将干净的铁钉分别同时入放A、B、C三支试管中进行研究． （1）请你帮助该学生完成下列实验设计的内容 编号 操作方法 实验目的 A ______ 探究铁在干燥空气中的生锈情况 B 放入铁钉，注入蒸馏水浸没铁钉，并用植物油封液 ______ C ______ 探究铁在有空气和时的生锈情况 （2）一后，编号为______的试管中的铁钉最容易生锈． （3）用相同材料制作，经过相同时间防锈处理的铁栏杆，安装在南方比安装在北方更易生锈，其原因是______．
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举一反三
【多选题】Currently, different types of multimodal transport operations involving different combination are taking place. The following combinations ( ) are involving rail transport.
A.
sea/air
B.
mini-bridge
C.
land bridge
D.
air/road
查看完整题目与答案
【单选题】The color purple is a _____ of red and blue. [     ]
A.
collection
B.
unity
C.
joint
D.
combination
查看完整题目与答案
【单选题】The power of words lies in their__________ ．
A.
beauty
B.
accuracy
C.
combinations
D.
charm
查看完整题目与答案
【单选题】This report was produced by the Government in () with the chemical industry.
A.
combination
B.
cooperation
C.
work
D.
partnership
查看完整题目与答案
【单选题】磁性温控器的居里点
A.
随着温度的升高而升高
B.
随着温度的升高而降低
C.
与是否加热无关
查看完整题目与答案
【单选题】某人群中某疾病发生的阳性数 X服从二项分布,则从该人群随机抽出n个人,阳性数X不少于k人的概率为( )
A.
P (k)+ P (k+1)+…+ P (n)
B.
P (k+1)+ P (k+2)+…+P(n)
C.
P (1)+ P (2)+…+P(k)
D.
P (0)+ P (1)+…+P(K)
查看完整题目与答案
【单选题】---- Housing prices are likely to stop rising because the governments at all levels ______a combination blow(组合拳) to the real-hot property markets. ---- Really good news!
A.
gave
B.
gives
C.
have been giving
D.
are giving
查看完整题目与答案
【单选题】若人群中某疾病发生的阳性数X服从二项分布,则从该人群随机抽取n个人,阳性数X不小于k人的概率为( )。
A.
P(k)+P(k+1)+...+P(n)
B.
P(k+1)+P(k+2)+...+P(n)
C.
P(0)+P(1)+...+P(k)
D.
P(0)+P(1)+...+P(k-1)
查看完整题目与答案
【单选题】Which of the foilowing is correct according to the passage?
A.
Adidas described the combination opportunity as the only one and would never emerge again.
B.
Both Adidas and Reebok have been paying large amounts of money to endorse their products.
C.
The two brands will have the same identity after the combination.
D.
Reebok will focus on goods for competitive sports as well as consumer lifestyle.
查看完整题目与答案
【单选题】若某人群某疾病发生的阳性数X服从二项分布，则从该人群中随机抽出n个人，阳性数X不少于k人的概率为（）。
A.
P（k+1）+P（k+2）+…+P（n）
B.
P（0）+P（1）+…+P（k）
C.
P（0）+P（1）+…+P（k+1）
D.
P（k）+P（k+1）+…+P（n）
E.
P（1）+P（2）+…+P（k）
查看完整题目与答案
相关题目：
【多选题】Currently, different types of multimodal transport operations involving different combination are taking place. The following combinations ( ) are involving rail transport.
A.
sea/air
B.
mini-bridge
C.
land bridge
D.
air/road
查看完整题目与答案
【单选题】The color purple is a _____ of red and blue. [     ]
A.
collection
B.
unity
C.
joint
D.
combination
查看完整题目与答案
【单选题】The power of words lies in their__________ ．
A.
beauty
B.
accuracy
C.
combinations
D.
charm
查看完整题目与答案
【单选题】This report was produced by the Government in () with the chemical industry.
A.
combination
B.
cooperation
C.
work
D.
partnership
查看完整题目与答案
【单选题】磁性温控器的居里点
A.
随着温度的升高而升高
B.
随着温度的升高而降低
C.
与是否加热无关
查看完整题目与答案
【单选题】某人群中某疾病发生的阳性数 X服从二项分布,则从该人群随机抽出n个人,阳性数X不少于k人的概率为( )
A.
P (k)+ P (k+1)+…+ P (n)
B.
P (k+1)+ P (k+2)+…+P(n)
C.
P (1)+ P (2)+…+P(k)
D.
P (0)+ P (1)+…+P(K)
查看完整题目与答案
【单选题】---- Housing prices are likely to stop rising because the governments at all levels ______a combination blow(组合拳) to the real-hot property markets. ---- Really good news!
A.
gave
B.
gives
C.
have been giving
D.
are giving
查看完整题目与答案
【单选题】若人群中某疾病发生的阳性数X服从二项分布,则从该人群随机抽取n个人,阳性数X不小于k人的概率为( )。
A.
P(k)+P(k+1)+...+P(n)
B.
P(k+1)+P(k+2)+...+P(n)
C.
P(0)+P(1)+...+P(k)
D.
P(0)+P(1)+...+P(k-1)
查看完整题目与答案
【单选题】Which of the foilowing is correct according to the passage?
A.
Adidas described the combination opportunity as the only one and would never emerge again.
B.
Both Adidas and Reebok have been paying large amounts of money to endorse their products.
C.
The two brands will have the same identity after the combination.
D.
Reebok will focus on goods for competitive sports as well as consumer lifestyle.
查看完整题目与答案
【单选题】若某人群某疾病发生的阳性数X服从二项分布，则从该人群中随机抽出n个人，阳性数X不少于k人的概率为（）。
A.
P（k+1）+P（k+2）+…+P（n）
B.
P（0）+P（1）+…+P（k）
C.
P（0）+P（1）+…+P（k+1）
D.
P（k）+P（k+1）+…+P（n）
E.
P（1）+P（2）+…+P（k）
查看完整题目与答案
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