A new technique is described for safety-valve on-line testing in which out-source gas is introduced into the cavity enclosed by the valve plug and rupture disk.
介绍了一种利用外接气源，向安全阀瓣与爆破片形成的隔离腔内直接充压，对安全阀进行在线检测的方法。
"Russia has been a reliable source of gas for 35 years," said a spokeswoman for E.ON, pointing out that business ties had survived crises like oil price hikes and the fall of the Soviet Union.
“俄罗斯已经稳定地提供了35年的能源”，E.O N的女发言人说，并指出这种稳定的能源供应经历过许多危机，比如说油价飙升以及苏联解体。
This paper analyzes air source in heating system, states that gas is harmful in the system, points out level pipe gradient being small in single measure system, and velocity of flow must keep great.
本文通过分析采暖系统中的空气的来源，提出空气在系统中的危害，针对单户计量系统中水平管坡度较小，提出水平支管中水流速应保持较大。
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