单项选择题
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
单项选择题 In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause（）
单项选择题 One function provided by a hydraulic accumulator is to（）
单项选择题 A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oilAnother function is to（）