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You must keep your eyes if you are going to make your trip enjoyable and worthwhile. A, opened, to be     B, open, to be             C, opened,  be         D, open,  /
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【单选题】短周期元素A、B、C、D在周期表中的位置如图所示，若A的原子序数为a、最外层电子数为n，则下列关系式或说法错误的是（　　） A B C D
A.
四种元素的原子序数之和Z=4a+16
B.
四种元素的原子序数之和Z≤50
C.
四种元素的最外层电子数之和E=4n+2
D.
四种元素的最外层电子数之和E≤30
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【单选题】It is often ____ the passenger to know _____ demands can be made in order to get compensation as soon as possible.
A.
up with...what
B.
up to...how much
C.
up to...what
D.
up with...which
查看完整题目与答案
【判断题】天然气和空气混合，当天然气浓度在一定范围内时，遇明火就会发生燃烧和爆炸。燃烧时，燃烧波的传播速度较慢，约0.3～2.4m/s，而爆炸时，会迅即产生高压高温，波速达到1000～3000m/s，对管线和容器的破坏力很大。天然气产生爆炸的浓度范围为5～15％，随温度、压力升高，爆炸浓度的上限提高，爆炸范围扩大。Natural gas and air mix, when the concentration...
A.
正确
B.
错误
查看完整题目与答案
【简答题】某种商品在30天内每件的销售价格P（元）与时间t（t∈N * ）（天）的函数关系用如图的两条线段表示，该商品在30天内日销售量Q（件）与时间t（t∈N * ）（天）之间的关系如下表： 第1天 5 15 20 30 Q件 35 25 20 10 （Ⅰ）根据提供的图象，写出该商品每件的销售价格P与时间t的函数关系； （Ⅱ）根据表中提供的数据，确定日销售量Q与时间t的一个函数关系式； （Ⅲ）求该商品的日...
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【单选题】One of the most hazardous conditions a fire- fighter will ever encounter is a backdraft (also known as a smoke explosion). A backdraft can occur in the hot-smoldering phase of a fire when burning is i...
A.
has more oxygen available for combustion.
B.
has more carbon dioxide available for consumption.
C.
produces more dense gray smoke.
D.
is more likely to cause a backdraft.
查看完整题目与答案
【单选题】One of the most hazardous conditions a fire- fighter will ever encounter is a backdraft (also known as a smoke explosion). A backdraft can occur in the hot-smoldering phase of a fire when burning is i...
A.
carry an oxygen tank.
B.
open a door to allow gases to escape.
C.
make an opening at the top of the building.
D.
break a window to release carbon particles.
查看完整题目与答案
【简答题】Fuel gases are very combustible and can easily explode. Explosions can occur when a gas leaks from its container and reaches an ignition source, such as an open flame or spark. In the United States, m...
查看完整题目与答案
【单选题】在元素周期表中，A、B、C、D、X五种元素的位置关系如下图所示，已知X元素最高价氧化物的水化物化学式为H 3 XO 4 ，在这五种元素中有一种元素的原子半径在同主族元素中最小。则A元素是 [     ]
A.
N
B.
Si
C.
P
D.
S
查看完整题目与答案
【单选题】One of the most hazardous conditions a fire- fighter will ever encounter is a backdraft (also known as a smoke explosion). A backdraft can occur in the hot-smoldering phase of a fire when burning is i...
A.
windows stained with smoke
B.
flames shooting up from the building
C.
puffs of smoke leaving the building
D.
more intense heat than usual
查看完整题目与答案
【单选题】监督矩阵的每行中()的位置表示相应码元之间存在的监督关系。
A.
1
B.
2
C.
3
D.
n
查看完整题目与答案
相关题目：
【单选题】短周期元素A、B、C、D在周期表中的位置如图所示，若A的原子序数为a、最外层电子数为n，则下列关系式或说法错误的是（　　） A B C D
A.
四种元素的原子序数之和Z=4a+16
B.
四种元素的原子序数之和Z≤50
C.
四种元素的最外层电子数之和E=4n+2
D.
四种元素的最外层电子数之和E≤30
查看完整题目与答案
【单选题】It is often ____ the passenger to know _____ demands can be made in order to get compensation as soon as possible.
A.
up with...what
B.
up to...how much
C.
up to...what
D.
up with...which
查看完整题目与答案
【判断题】天然气和空气混合，当天然气浓度在一定范围内时，遇明火就会发生燃烧和爆炸。燃烧时，燃烧波的传播速度较慢，约0.3～2.4m/s，而爆炸时，会迅即产生高压高温，波速达到1000～3000m/s，对管线和容器的破坏力很大。天然气产生爆炸的浓度范围为5～15％，随温度、压力升高，爆炸浓度的上限提高，爆炸范围扩大。Natural gas and air mix, when the concentration...
A.
正确
B.
错误
查看完整题目与答案
【简答题】某种商品在30天内每件的销售价格P（元）与时间t（t∈N * ）（天）的函数关系用如图的两条线段表示，该商品在30天内日销售量Q（件）与时间t（t∈N * ）（天）之间的关系如下表： 第1天 5 15 20 30 Q件 35 25 20 10 （Ⅰ）根据提供的图象，写出该商品每件的销售价格P与时间t的函数关系； （Ⅱ）根据表中提供的数据，确定日销售量Q与时间t的一个函数关系式； （Ⅲ）求该商品的日...
查看完整题目与答案
【单选题】One of the most hazardous conditions a fire- fighter will ever encounter is a backdraft (also known as a smoke explosion). A backdraft can occur in the hot-smoldering phase of a fire when burning is i...
A.
has more oxygen available for combustion.
B.
has more carbon dioxide available for consumption.
C.
produces more dense gray smoke.
D.
is more likely to cause a backdraft.
查看完整题目与答案
【单选题】One of the most hazardous conditions a fire- fighter will ever encounter is a backdraft (also known as a smoke explosion). A backdraft can occur in the hot-smoldering phase of a fire when burning is i...
A.
carry an oxygen tank.
B.
open a door to allow gases to escape.
C.
make an opening at the top of the building.
D.
break a window to release carbon particles.
查看完整题目与答案
【简答题】Fuel gases are very combustible and can easily explode. Explosions can occur when a gas leaks from its container and reaches an ignition source, such as an open flame or spark. In the United States, m...
查看完整题目与答案
【单选题】在元素周期表中，A、B、C、D、X五种元素的位置关系如下图所示，已知X元素最高价氧化物的水化物化学式为H 3 XO 4 ，在这五种元素中有一种元素的原子半径在同主族元素中最小。则A元素是 [     ]
A.
N
B.
Si
C.
P
D.
S
查看完整题目与答案
【单选题】One of the most hazardous conditions a fire- fighter will ever encounter is a backdraft (also known as a smoke explosion). A backdraft can occur in the hot-smoldering phase of a fire when burning is i...
A.
windows stained with smoke
B.
flames shooting up from the building
C.
puffs of smoke leaving the building
D.
more intense heat than usual
查看完整题目与答案
【单选题】监督矩阵的每行中()的位置表示相应码元之间存在的监督关系。
A.
1
B.
2
C.
3
D.
n
查看完整题目与答案
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