题目内容
（请给出正确答案）
Mercury (水银) is ______ all metal because it is liquid.
A．more than difference
B．most different in
C．more difference of
D．the most different of
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更多“Mercury （水银) is ______ all metal because it is liquid.A．more than differenceB．most diffe”相关的问题
A、水银会膨胀当它热的时候,缩小当它冷的时候。
B、水银会热胀冷缩。
As an illustration of this we can consider the discovery of air pressure. Over two thousand years ago, men discovered a method of raising water from one level to another by means of the vacuum pump. When, however, this machine passed into general use in the fifteenth and sixteenth centuries, it was not possible to raise water vertically more than about 35 feet. Why？ Galileo, amongst others, recognized the problem, but failed to solve it.
The problem was then attacked by Torricelli. Analogizing(作类比推理) from the recently-discovered phenomenon of water-pressure, he postulated(假定) that a deep "sea of air" surrounded the earth; it was, he thought, the pressure of this sea of air that pushed on the surface' of the water and caused it to rise in the vacuum tube of a pump. A hypothesis, then, was formed. The next step was to deduce the consequences of the hypothesis. Torricelli reasoned that this "air pressure" would be unable to push a liquid heavier than water as high as 35 feet, and that a column of mercury(水银), for example, which weighed about 14 times more than water, would rise to only a fourteenth of the height of water, i.e. approximately 2.5 feet. He then tested this deduction by means of the experiment we all know, and found that the mercury column measured the height predicted. The experiment therefore supported the hypothesis. A further inference was drawn by Pascal, who reasoned that if this "sea of air" existed, its pressure at the bottom(i.e. sea level) would be greater than its pressure further up, and that therefore the height of the mercury column would decrease in proportion to the height above sea-level. He then carried the mercury tube to the top of a mountain and observed that the column fell steadily as the height increased, while another mercury column at the bottom of the mountain remained steady. This further proof not only established Torricelli's hypothesis more securely, but also demonstrated that, in some aspects, air behaved like water.
Why does the author mention the discovery of air pressure？
A．To show that air behaves like water in some aspects.
B．To illustrate the special sequence of procedures involved in the establishment of the working laws of science.
C．To indicate that it was difficult to use scientific methods to solve the problem of vacuum pump.
D．To show how scientists make experiments to test their deductions.
A.Mercury, Venus
B.Asaph,Hall
C.Phobos, Deimos
D.Romeo, Juliet
Mercury is the nearest planet to the sun and its period of ______is 88 days.
A．movement
B．evolution
C．return
D．revolution
Of all the planets in this solar system, Mercury is nearest the Sun.
A．most like
B．closest to
C．hotter than
D．heavier than
【单选题】Which one of the following words is the correct English translation for "木星"？
A.Mars
B.Jupiter
C.Uranus
D.Mercury
The mercury in the thermometer is______ to changes in temperature.
A．sensitive
B．sensible
C．sentimental
D．sensational
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