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【单选题】
（）如下说法正确的是（）A.
泵的串联操作只能提高管路流体的流量，无法提高其外加压头
B.
泵的并联操作只能提高管路流体的流量，无法提高其外加压头
C.
无论是泵的串联还并联，均可同时提高管路流体的流量和外加压头
D.
那三个说法都不对
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C.
few people had trouble telling Coca-Cola from Pepsi
D.
people's tastes differ from one another
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