helium造句
31. Supplies of liquid helium are an absolute necessity in many modern science laboratories.
32. The helium in his gas mixture fried his nervous system.
33. I wish people would stop buying helium balloons and letting them go.
34. A second problem emerged with the need to construct lightweight vessels to contain the recently discovered gas helium.
35. Breastfeeding does perky things to some women's statistics, but it left mine looking like two well-past-their-sell-by-date helium balloons.
36. Helium is also made by radioactive decay of uranium and thorium, both of which decay by emission of alpha particles.
37. The Kamikaze: One part liquid helium, two parts prussic acid.
38. Helium, the next element in the periodic table, contains two electrons encircling a nucleus containing two protons.
39. Kulcinski argues that the solar wind has implanted great quantities of hydrogen and helium into the lunar regolith.
40. Indeed, only one known substance is harder to liquefy than hydrogen: helium gas.
41. Both materials were removed in a 550-torr helium arc discharge sustained by 28 V at 70 amps d.c.
42. The helium atom without its electrons is known as an alpha particle, and is therefore positively charged.
43. But in addition there remained the puzzle of how the helium came to be in the springs.
44. Clearly, helium has the least polarizable electron cloud.
45. Helium is a gas used in balloons.
46. Helium and argon are monatomic gases.
47. Helium gas was the thermometric fluid.
48. A fountain of helium spurt out of the tube.
49. Helium is a monatomic chemically inert gas.
50. Helium is a noble gas.
51. The first type discovered -- alpha decay -- is when a radioactive particle emits a Helium nucleus !
52. Upon gaining two electrons alpha particle becomes a helium atom.
53. The paper introduces the helium turbine which used in helium refrigerator of space environment simulator, including its design, setting-to-work test and its characteristics.
54. The dynamic simulation result also indicates that the trial-run scheme of helium refrigerator can be optimized and the debugging cost and time can be saved though dynamic simulation.
55. A synthetic element produced in trace quantities by helium isotope bombardment of curium.
56. Its lightweight design enables it to "swim" in the sea of air using the lift from the helium in a similar way to the manta ray in water.
57. The Apollo Lunar Excursion Module Descent Engine (LMDE) is helium pressure-fed with the throttling ratio of 10:1 and a multi-startup capability.
58. Variational and Semi - classical Methods. Ground state and first excited state of helium,[http:///helium.html] via the variational method.
59. Helium ion microscopy (HIM) offers the highest spatial resolution surface imaging of any scanning beam method, as well as extremely high surface sensitivity.
60. In September 1999, this dramatic and detailed image was recorded by the EIT experiment on board the space-based SOHO observatory in the light emitted by ionized Helium.
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