单选题You should frequently compare drum-mounted and remote-reading water level indicators（） between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.AdescriptionsBdiscrepanciesCdifferentDdeflections
单选题
You should frequently compare drum-mounted and remote-reading water level indicators（） between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.
A
descriptions
B
discrepancies
C
different
D
deflections
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