题目：
二氧化碳气体预热器端的电压，不得大于（），作业后，应切断电源。
A、50V
B、36V
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
二氧化碳气体预热器端的电压，不得大于（），作业后，应切断电源。A、50V B、36V
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