Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）<br>A:When heated, it will move proportional to the amount the metal has lengthened or expanded<br>B:The pointer associated with the pyrometer scale can be made to also measure engine RPM<br>C:It can be utilized in exhaust manifolds and heat exchangers interchangeably<br>D:It can indicate temperature at a distant point from the source heat

Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）
A:When heated, it will move proportional to the amount the metal has lengthened or expanded
B:The pointer associated with the pyrometer scale can be made to also measure engine RPM
C:It can be utilized in exhaust manifolds and heat exchangers interchangeably
D:It can indicate temperature at a distant point from the source heat

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