Production History – This is a historical trend used to identify abnormal changes in production rates that could affect future supply.
生产历史– 这里展示的主要是历史生产趋势，用来找出上游生产中的异常变化，以及可能对今后原油供应的影响。
AC source may not deliver current to blow the fuse in a power supply, it is not suitable for abnormal test.
交流源不会提供足以烧断电源保险丝的电流﹐因此不适合非正常测试。
Safety devices can promptly cut off gas supply in case of abnormal leak. In the article, different types and the principle of operation of these devices are introduced.
安全型家用燃气灶能在非正常情况下煤气泄漏时及时切断煤气，防止用户的人身和财产受到损害。
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