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问题：
[单选题]生物安全柜的使用以下哪项是正确的？（ ）
A、生物安全柜在使用中可以打开玻璃观察挡板
B、操作者可以反复移出和伸进手臂以免干扰气流
C、在安全柜内的工作开始前和结束后，安全柜的风机应至少运行5分钟
D、所有工作必须在工作台面的前部进行
E、在生物安全柜内操作时，可以边操作边记录实验结果
参考答案：
C
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