叶轮或滤水网被杂物堵塞是造成潜水泵不出水后出水量不足的原因之一。
参考答案：对
We have every reason to believe that ______ 2010 World Expo in Shanghai will be ______ success.
A．/; a
B．the; /
C．the; a
D．a; a
配电变压器的节能措施
