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【单选题】
并联管道阀门 K 全开时各段流量为 Q 1 、 Q 2 、 Q 3 ,现阀门 K ,其它条件不变,流量的变化为( )A.
Q 1 、 Q 2 、 Q 3 都减小
B.
Q 1 减小， Q 2 不变， Q 3 减小
C.
Q 1 减小， Q 2 增加， Q 3 减小
D.
Q 1 不变， Q 2 增加， Q 3 减小
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