超声波抽提气溶胶样品，用GC - MS的选择离子监测(SIM)方式测定EPA提出的优先监测的16种多环芳烃的含量。
The aerosol sample was extracted by ultrasonic technique and 16 of the PAH's were determined, in priority, as proposed by EPA, by GC-MS with selected-ion monitoring (SIM).
介绍了一种利用阳离子化改性多羟基化合物进行堵水调剖的方法，具有一定的选择性，在油田应用取得了良好效果。
A modified cationic polyhydroxy compound gelling fluid as water shutoff is developed. This type of gel has better selectivity. Its field tests are described and the results are satisfactory.
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