问题：
[单选题]某台离心泵装置的运行功率为N,采用变阀调节后流量减小,其功率变由N为N\',则调节前后的功率关系为（）
A、N\'<N
B、N\'=N
C、N\'>N
D、N\' ≥N
参考答案：
A
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