单选题
Which of the following operations may be dangerous?
A、
Overfilling the cooker with food and water.
B、
Cleaning the cooker with detergent.
C、
Cooling the cooker with cold water.
D、
Setting too little cooking time.
【正确答案】
A
【答案解析】
[分析] 由第二条原则“Overfilling the cooker may block the vent pipe and cause the cooker to explode．”可知答案为A。
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