题目内容

在汽车还未启动时是由蓄电池向有关用电设备供电；而在发动机运转后，发电机转速达到规定的发电转速时，由发电机向有关用电设备供电，同时对蓄电池进行充电。

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所谓负极搭铁指的是在采用单线制时将蓄电池的负极用导线连接到发动机或底盘等金属车体上称为负极搭铁。

The main type of fermentation in the early stage of kimchi fermentation is iso-lactic acid fermentation.

In the process of food fermentation, alcohol has preservative effect are mainly depending on its concentration.

The main biochemical action in the process of vinegar brewing is ( ).

A. saccharification
B. lactic acid fermentation
C. alcohol fermentation
D. acetic acid fermentation