【单选题】
下列哪项是A类泡沫消防车消防泵射程不足的原因___。
A. 未达到标定工作压力
B. 供水量不足,叶轮松动
C. 泵内或叶轮内有异物
D. 滤水器或吸入口外露,吸入了空气
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答案
A
解析
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