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箱式电阻炉炉门下的行程开关作用是( )

单选题
2021-09-01 22:39
A、限制炉门开得大小
B、调节炉温
C、保证打开炉门时电阻炉断电
D、保证关闭炉门时电阻炉断电
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正确答案
C

试题解析

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