单选题How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）Aclean the fittings before they are disconnectedBPlace drip pans under leaky fittingsCSeal any cracks in lines with PermatexDCoat all threads with graphite oil
单选题
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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