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单项选择题
当经济处于衰退时,美联储可以________联邦基金率,这可以________总需求,同时________实际GDP。
A.降低;增加;减少
B.提高;减少;增加
C.降低;增加;增加
D.提高;增加;减少
E.降低;减少;减少
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_______can cause oil flow from water outlet of the oil purifier.
A.Oil inlet valve opening too quickly
B.Oil temperature little higher than normal
C.Diameter of gravity disc too small
D.Viscosity of oil little lower than normal
A.A.Oil
B.Oil
C.Diameter
D.Viscosity
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单项选择题
Among the basic categories of equipment, which of the following are used to convert the hydraulic energy into linear motion?
A.hydraulic pumps
B.valves
C.hydraulic cylinders
D.hydraulic motors
A.hydraulic
B.valves
C.hydraulic
C.hydraulic
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