Helium is used for arc welding and leak detection, mostly, although NASA USES it to pressurize space shuttle fuel tanks.
虽然美国宇航局用它来给航天飞船的燃料箱加压，氦主要还是用来做弧焊和裂纹检测。
Under the background of development of leak detection devices of automobile fuel oil systems, the detecting methods of airproof and leak in automobile fuel oil systems are introduced.
以汽车燃油系统的泄漏检测装置的开发为背景，介绍了汽车燃油系统的密封和泄漏的检测方法。
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