注水量下降，其中地面设备影响是指：流量计指针落到零以下，使记录的压差数值偏小，地面管线有堵塞，孔板直径比设计（）造成记录值偏低。_采油初级工考试_全学科试题题库

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注水量下降，其中地面设备影响是指：流量计指针落到零以下，使记录的压差数值偏小，地面管线有堵塞，孔板直径比设计（）造成记录值偏低。
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