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【简答题】
10已知A、B、D、E均为中学化学常见单质及化合物，它们之间的转化关系如图所示（部分产物略去） （1）若A和E均为单质且B物质为极性键形成的非极性分子。B的结构式为____。 (2)若A为可溶性强碱（MOH），E为同主族元素形成的常见非金属化合物，且该化合物中两种元素的质量比为1:1，试写出A到B的化学方程式______。 (3)若取B的溶液装于试管，向溶液中滴加KSCN溶液，无明显现象，再滴加稀盐酸，产生红色溶液，则用化学方程式表示工业制备E化学原理______；D的溶液中含有少量B，用离子方程式表示除杂方法_______。
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【单选题】维持胸内负压的必要条件是
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呼吸道内存在一定压力
B.
吸气肌收缩
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肺内压低于大气压
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【简答题】An instrument to measure the acceleration of gravity on Mars is constructed of a spring from which is suspended a mass of 0.24(kg). At a place on earth where the local acceleration of gravity is 9.80(...
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【单选题】A rock is thrown off a 35 m cliff at a 45° angle above the horizontal. Which is the following is true regarding the acceleration of the rock?
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B.
At the peak of the rock’s path, the magnitude of acceleration will be half of what it was when the rock was initially thrown.
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【单选题】To the author E-mail is______.
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the living embodiment of human connection in all areas
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【单选题】Orbits decay due to ______.
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the acceleration of the spacecraft
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the crash with small amounts of air molecules
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the invention and application of solar sails
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the existence of air molecules
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相关题目：
【单选题】维持胸内负压的必要条件是
A.
呼吸道内存在一定压力
B.
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C.
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【简答题】An instrument to measure the acceleration of gravity on Mars is constructed of a spring from which is suspended a mass of 0.24(kg). At a place on earth where the local acceleration of gravity is 9....
查看完整题目与答案
【单选题】The acceleration of a projectile is:
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B.
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C.
0
D.
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查看完整题目与答案
【单选题】维持胸内负压的必要条件是
A.
膈肌收缩
B.
肋间外肌收缩
C.
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D.
肺内压高于大气压
E.
肺内压低于大气压
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【简答题】An instrument to measure the acceleration of gravity on Mars is constructed of a spring from which is suspended a mass of 0.24(kg). At a place on earth where the local acceleration of gravity is 9.80(...
查看完整题目与答案
【单选题】柳永《八声甘州》(对潇潇暮雨洒江天)中具有承上启下作用的句子是
A.
不忍登高临远
B.
叹年来踪迹
C.
渐霜风凄紧
D.
是处红衰翠减
查看完整题目与答案
【单选题】A rock is thrown off a 35 m cliff at a 45° angle above the horizontal. Which is the following is true regarding the acceleration of the rock?
A.
The acceleration will be of magnitude g and have both horizontal and vertical components.
B.
At the peak of the rock’s path, the magnitude of acceleration will be half of what it was when the rock was initially thrown.
C.
The acceleration will be of magnitude g and in a downward direction.
D.
The acceleration will be downward during the rock’s ascent and upward during the rock’s descent.
E.
The acceleration will increase throughout the rock’s flight .
查看完整题目与答案
【单选题】To the author E-mail is______.
A.
the authority on the acceleration of life pace
B.
the essence of life
C.
both the catalyst and the instrument of the change in human interaction
D.
the living embodiment of human connection in all areas
查看完整题目与答案
【单选题】Orbits decay due to ______.
A.
the acceleration of the spacecraft
B.
the crash with small amounts of air molecules
C.
the invention and application of solar sails
D.
the existence of air molecules
查看完整题目与答案