二、請說明螺旋泵（Screw pump）之構造並敘述其工作原理。（20 分）

四、請將下列英文譯成中文。（20 分） The rate of flow of heat through a heat exchanger tube or plate from the fluid at the higher temperature to the one at the lower is related to the temperature difference between the two fluids, the ability of the material of the tube or plate to conduct and the area and thickness of the material.