How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）<br>A:clean the fittings before they are disconnected<br>B:Place drip pans under leaky fittings<br>C:Seal any cracks in lines with Permatex<br>D:Coat all threads with graphite oil

How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）
A:clean the fittings before they are disconnected
B:Place drip pans under leaky fittings
C:Seal any cracks in lines with Permatex
D:Coat all threads with graphite oil

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