题目内容

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

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

查看答案

搜索结果不匹配？点我反馈

更多问题

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 =______ 。

在三相交流电路中,保险丝不可以安装在中性线上。( )