离心泵轴功率随着泵出口流量的增加而增加。（）
参考答案：对
Many people think that English soccer star David Beckham is( )a pop star( )a player.
A．mainly; than
B．either; or
C．very much; not
D．more of; than
固定桥的固位丕星依靠
A．摩擦力
B．约束力
C．粘结力
D．压应力
E．约束反力
