当泵站中水泵吸水管口径较大水泵安装高度较高时，常采用（）引水方式。
A、自灌式
B、人工灌水
C、高位水箱
D、真空
参考答案：D
下面是“沉鱼落雁”的典出，仔细阅读，跳出思维定势，你认为庄子这一故事的本意是什么?
毛墙、丽姬，人之所美也；鱼见之深入，鸟见之高飞，麇鹿见之决骤，四者孰知天下之正色哉?
Jenny went into the room, took off her coat and _____ down on a sofa.[ ]
A. would sit
B. was sitting
C. sat
D. had sat
