Puan Rika is preparing food in the school canteen. Which of the following is the most effective for preventing bacteria from spreading to the food?
丽卡女士正在学校的食堂准备食物。下面哪项能最有效地防止细菌散布到食物里？
Puan Rika is preparing food in the school canteen. Which of the following is the most effective for preventing bacteria from spreading to the food?
丽卡女士正在学校的食堂准备食物。下面哪项能最有效地防止细菌散布到食物里？
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