单项选择题
A.coolant for the distillate
B.coolant for the brine cooler
C.means of heating the feedwater
D.primary means of producing a vacuum within the distiller
单项选择题 The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to （）.
单项选择题 Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.
单项选择题 Two important considerations for the proper lubrication of a diesel engine include the delivery of the oil in sufficient amount and the （）.