为了提高节流式流量传感器的测量精度,国家标准规定:在节流装置的前、后均应装有直管段(管道的内径为D),其前和后长度分别为
A.5 D和l0 D
B.10 D和5 D
C.10 D和20D
D.20D和l0 D
正确答案是B
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