问题：
[单选题]地下水除铁除锰采用射流曝气装置时,其构造应根据工作水的( )、需气量和出口压力等通过计算确定。工作水可采用全部、部分原水或其他压力水。
A、压力
B、流量
C、水质
D、来源
参考答案：
A
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