题目内容
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Helium is not flammable and, next to hydrogen, is ______
A．known the lightest gas
B．lightest the known gas
C．the lightest gas known
D．the known gas lightest
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更多“Helium is not flammable and, n…”相关的问题
THRIFTY : MISERLY::
A．receptive : gullible
B．controversial : scandalous
C．incendiary : flammable
D．commodious : discriminatory
E．inclusive : genteel
The author mentions that tile nuclear fusion is a result of______.
A．hydrogen fusing into helium
B．hydrogen and helium becoming hot
C．helium changing to carbon and oxygen
D．an increase of helium at the center
The use of helium for deep-sea diving
A．helped to overcome the physical discomforts the divers experienced when nitrogen was used.
B．was found by Dr. Jeol Hiderbrand.
C．is still universally acknowledged as standard practice up to now.
D．all that is included in A, B, and C.
Helium is not flammable and, next to hydrogen, is ______
A．known the lightest gas
B．lightest the known gas
C．the lightest gas known
D．the known gas lightest
A、Both the temperature and the pressure are the pressure are not the same.
B、The temperature is the same, but the pressure of the helium is larger than that of nitrogen.
C、Both the temperature and the pressure are the same.
D、The temperature is the same, but the pressure of the nitrogen is larger than that of helium.
Why did the balloon attempt fail？
A．It twisted and the helium at the top came under pressure, causing a seam to split.
B．The weather conditions were not perfect.
C．They had difficulty in inflating the balloon.
D．The Mission Controller stopped trying.
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