A.
比摩阻即每米管长的沿程压力损失 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
B.
prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> B 、比摩阻即每米管长的压力损失
C.
C 、比摩阻与流量无关 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
D.
D 、比摩阻与管径无关 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>