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单选题
用差压变送器测锅炉水位时,常采用参考水位罐。为使水位上升时,变送器输出也随之增大,则测量水位管应接(),参水位管应接(),同时进行负迁移。
A
正压室;负压室
B
正压室;正压室
C
负压室;正压室
D
负压室;负压室
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