单项选择题
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
单项选择题 A refrigerant with oil in solution has a （）.
单项选择题 Which of the following terms would best describe the temperature at which a liquid boils at a given pressure?（）
单项选择题 To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the （）.
