在( )
说理:
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个球,其中有
个红球、
个绿球和
个蓝球,这些球除颜色外无其他差别.从袋子中随机取出
个球,则它是红球的概率是.
,
为常数,则
( )
B .
C .
D . 2sin
的解集是.
的图象与性质.通过分析,该函数y与自变量x的几组对应值如下表,并画出了部分函数图象如图所示. | x | 1 | | | | 3 | 4 | 5 | 6 | … |
| y | ﹣1 | ﹣2 | ﹣3.4 | ﹣7.5 | 2.4 | 1.4 | 1 | 0.8 | … |
的自变量x的取值范围是;
=x+b有两个不相等的实数根,结合图象,可知实数b的取值范围是.
加热:使用后吹灭并盖上灯帽 |
吸取液体:滴管口向上防止液体流出 |
测量液体体积:不能被加热 |
称量药品:药品直接放置在天平上 |
A | B | C | D |
中,
,
,E是
的中点,将
沿直线
翻折,点B落在点F处,连结
,则
的值为( )

B .
C .
D .
辆 棵 册 匹 架 朵
一车 一书 一云
一树 一马 一飞机
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]是重要的化工过程,主要用于合成氨、制氢以及合成气加工等工业领域中。回答下列问题:
②在同一温度下用CO还原CoO(s),平衡后气体中CO的物质的量分数为0.0192。
根据上述实验结果判断,还原CoO(s)为Co(s)的倾向是COH2(填“大于”或“小于”)。

可知水煤气变换的ΔH0(填“大于”“等于”或“小于”),该历程中最大能垒(活化能)E正=eV,写出该步骤的化学方程式。
和
相等、
和
相等。
计算曲线a的反应在30~90 min内的平均速率
=
。467 ℃时
和
随时间变化关系的曲线分别是、。489℃时
和
随时间变化关系的曲线分别是、。


①气候影响很大 ②地形影响很大 ③交通影响很大 ④矿产资源储量影响很大