分子云是一个包含冷却星际气体和尘埃的区域，这些气体和尘埃是星系形成之后的残留物，主要由氢分子组成。
A molecular cloud is a region containing cool interstellar gas and dust left over from the formation of the galaxy and mostly contains molecular hydrogen.
采用程序升温气相色谱法和氢火焰离子化检测器，对土壤中15种农药的残留量进行检测，该法简便、快速。
The amounts of 15 kinds of pesticide residues in soil were determined by gas chromatography of programing temperature with FID detector. The method is simple and rapid.
研究了预塑变对爆轰处理和未爆轰处理样品的强度、表面残留应力、氢脆敏感性及其关系的影响。
Investigation was made of effect of preplastic deformation for unexplosive and explosive treatments on strength, surface residual stress and hydrogen embrittlement of the specimens.
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