前言： 随着“西气”进沪，上海形成了“东、西”双气源供气的格局。
The entrance of West gas into Shanghai has made it a double-gas supplied city.
建立了测定动物源产品中双甲脒及其代谢产物残留量的气相色谱—质谱法，并对样品预处理的方法和定量检测条件作了较详细的探讨。
An analytical method for the determination of amitraz and 2,4-dimethyl anilinein in foods of animal origin was developed by gas chromatography-mass spectrometry.
安全值。然后根据气源工作压力，查找双作用式或单作用式输出扭矩表，可得到准确的执行器信号。单作用式输出扭矩。
100% security value. Then the gas supply pressure of work, find the double-action or single-acting output torque table, available and accurate actuator signal. Single-acting torque.
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