单选题Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）AWhen heated, it will move proportional to the amount the metal has lengthened or expandedBThe pointer associated with the pyrometer scale can be made to also measure engine RPMCIt can be utilized in exhaust manifolds and heat exchangers interchangeablyDIt can indicate temperature at a distant point from the source heat
单选题
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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