单选题Machinery operating features are designed to help conserve energy.Which of the following results will not contribute to energy conservation?（）AReduction of frictionBInsulation of hot surfacesCLubrication of moving partsDElevation of cooler outlet temperatures
单选题
Machinery operating features are designed to help conserve energy.Which of the following results will not contribute to energy conservation?（）
A
Reduction of friction
B
Insulation of hot surfaces
C
Lubrication of moving parts
D
Elevation of cooler outlet temperatures
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