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【单选题】
下列有关生态系统功能的描述，错误的是（）
A.
物质循环的关键环节是分解者的分解作用
B.
物质流是循环的，能量流是单向的，信息流往往是双向的
C.
一个生态系统的营养级越多，消耗的能量就越多，人类可利用的能量就越少
D.
信息传递有利于沟通生物群落与非生物环境之间、生物与生物之间的关系
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参考答案：
举一反三
【判断题】低瓦斯矿井是不会发生瓦斯燃烧和爆炸的。
A.
正确
B.
错误
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【单选题】— , how can I get to the bus station? —Go down this road and turn right at the second crossing. You'll find it easily.
A.
By the way
B.
On the way
C.
In a word
查看完整题目与答案
【简答题】完形填空。 A few days ago I got on a bus and took a window seat. The bus 1 was by the seashore and I was watching the sea waves. After a few minutes the bus got to the next 2 . A boy and a girl got on the ...
查看完整题目与答案
【单选题】The bus ____ down by the side of the road and the driver tried to repair it.
A.
breaks
B.
has broken
C.
was breaking
D.
broke
查看完整题目与答案
【单选题】Stepping carelessly off the pavement, he was knocked down by a bus.
A.
简单句
B.
并列句
C.
复合句
查看完整题目与答案
【单选题】听力原文：M: What happened to you? You are so late. W: The bus I took broke down in front of the hospital and I had to walk from there. Q: Why was the woman so late? (14)
A.
She went to the hospital on his way.
B.
She was held up by the traffic in front of the hospital.
C.
Hex car had gone wrong and she took a bus.
D.
She walked half of her way to work instead of riding on a bus.
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【单选题】()必须装备矿井安全监控系统。
A.
高瓦斯矿井和低瓦斯矿井
B.
煤与瓦斯突出矿井
C.
高瓦斯和煤(岩)与瓦斯突出矿井
D.
所有矿井
查看完整题目与答案
【简答题】三、完形填空(共10小题,每小题2分,计20分) It was at 7:20 am on August 8, 2017. Chen Yong was driving a traveling bus to Jiuzhaigou as usual. _1_ about 14 hours’ ride, the bus finally arrived at the scenic spot(景区). Al...
查看完整题目与答案
【多选题】矿井瓦斯爆炸的防治主要措施()
A.
防止瓦斯积聚
B.
防止瓦斯引燃
C.
防止瓦斯爆炸事故扩大
查看完整题目与答案
【单选题】下列关于瓦斯爆炸的条件，说法正确的是（）
A.
煤矿井下有瓦斯的地点就会发生瓦斯爆炸
B.
瓦斯爆炸通常发生在回风巷中，进风巷道中不会发生瓦斯爆炸
C.
采掘工作面，瓦斯浓度超过1.5%，就会发生爆炸
D.
瓦斯爆炸的三个条件同时具备时，就会发生爆炸
查看完整题目与答案
相关题目：
【判断题】低瓦斯矿井是不会发生瓦斯燃烧和爆炸的。
A.
正确
B.
错误
查看完整题目与答案
【单选题】— , how can I get to the bus station? —Go down this road and turn right at the second crossing. You'll find it easily.
A.
By the way
B.
On the way
C.
In a word
查看完整题目与答案
【简答题】完形填空。 A few days ago I got on a bus and took a window seat. The bus 1 was by the seashore and I was watching the sea waves. After a few minutes the bus got to the next 2 . A boy and a girl got on the ...
查看完整题目与答案
【单选题】The bus ____ down by the side of the road and the driver tried to repair it.
A.
breaks
B.
has broken
C.
was breaking
D.
broke
查看完整题目与答案
【单选题】Stepping carelessly off the pavement, he was knocked down by a bus.
A.
简单句
B.
并列句
C.
复合句
查看完整题目与答案
【单选题】听力原文：M: What happened to you? You are so late. W: The bus I took broke down in front of the hospital and I had to walk from there. Q: Why was the woman so late? (14)
A.
She went to the hospital on his way.
B.
She was held up by the traffic in front of the hospital.
C.
Hex car had gone wrong and she took a bus.
D.
She walked half of her way to work instead of riding on a bus.
查看完整题目与答案
【单选题】()必须装备矿井安全监控系统。
A.
高瓦斯矿井和低瓦斯矿井
B.
煤与瓦斯突出矿井
C.
高瓦斯和煤(岩)与瓦斯突出矿井
D.
所有矿井
查看完整题目与答案
【简答题】三、完形填空(共10小题,每小题2分,计20分) It was at 7:20 am on August 8, 2017. Chen Yong was driving a traveling bus to Jiuzhaigou as usual. _1_ about 14 hours’ ride, the bus finally arrived at the scenic spot(景区). Al...
查看完整题目与答案
【多选题】矿井瓦斯爆炸的防治主要措施()
A.
防止瓦斯积聚
B.
防止瓦斯引燃
C.
防止瓦斯爆炸事故扩大
查看完整题目与答案
【单选题】下列关于瓦斯爆炸的条件，说法正确的是（）
A.
煤矿井下有瓦斯的地点就会发生瓦斯爆炸
B.
瓦斯爆炸通常发生在回风巷中，进风巷道中不会发生瓦斯爆炸
C.
采掘工作面，瓦斯浓度超过1.5%，就会发生爆炸
D.
瓦斯爆炸的三个条件同时具备时，就会发生爆炸
查看完整题目与答案
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