求最远立最近立管的压力损失不平率,应使其在( )以内 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> A. ± 3% B. ± 6% C. ± 5% D. ± 7% A. A. ± 3% B. B. ± 6% prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> C. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> C. ± 5% D. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> D. ± 7%