三、以傳統平板計數法分析食品總菌數較耗時，無法快速得知結果。請寫出二種不同原理之分析食品總菌數的快速分析方法，並分別敘述其分析原理。（20 分）

五、將下列英文翻譯成中文：（20 分） The diesel engine piston is made of high grade cast iron suitable for high temperature and high pressure. The piston head is so shaped as to secure a good combustion. There are four piston rings at the upper part of the piston. The piston pin is inserted at its center and one oil ring each is equipped on its upper and lower side.