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If the system does not exchange energy with surroundings, it is an _______.

A. open system
B. closed system
C. isolated system
D. control volume

If the temperature of the liquid is lower than the saturation temperature for the existing pressure, it is called a _______ liquid.

A. superheated
B. subcooled
C. saturation
D. dry saturated

If the efficiency of a real engine is significantly _______ the efficiency of a Carnot engine between the same limits, then additional improvements may be possible.

A. lower than
B. more than
C. equal to
D. greater than

已知某用电设备的阻抗为|Z|=10Ω,R=3Ω,则其功率因数cosφ =______ 。