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【简答题】
在炼钢厂中,可以直接将廉价热电极(易耗品,例如镍铬、镍硅热偶丝,时间稍长即损坏)插入钢水中测量钢水的______,如图9-18所示。由于钢水是导______的,可以与消耗型快速热电偶的两根热电极形成回路,所以______必将工作端焊在一起。如果被测物是熔化的塑料,则______能形成导电回路,不可以使用消耗型快速热电偶。图9-18中的热电极的接线盒温度t 1 、t 2 必须相______,才不影响测量准确度。
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