第四章Whenever there is a temperature difference, heat must be transferred from the high temperature to the low temperature. 凡是有温度差存在时，热就必然从高温处传递到低温处。（ ）
答案:对
In the one-dimensional steady-state heat conduction process of the cylinder wall, which one in the following statement is true？在圆筒壁的一维稳态热传导过程中，下列说法正确的是. ( )The main purpose of setting baffle in shell of shell heat exchanger is to increase the convective heat transfer coefficient. 在管壳式换热器的壳程设置折流挡板主要目的是为了增加壳程的对流传热系数。（ ）
答案:对
The cold and hot fluids are counter-current heat exchangers in the casing heat exchangers. The inlet and outlet temperatures of hot fluid are 100℃ and 60℃, and the inlet and outlet temperatures of cold fluid are 20℃ and 50℃, then the average heat transfer temperature difference is. 冷、热流体在套管换热器内进行逆流换热。热流体的进、出口温度为100℃何60℃，冷流体的进出口温度为20℃和50℃，则平均传热温差为。( )The correct description of radiative heat transfer is . 关于辐射传热的描述，正确的是。( )
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