注水井生产原理是地面（）的高压水，通过井口装置从油管进到井下配水器对油层进行注水。
A、压力
B、泵站
C、管线
D、压强
参考答案：B
________ with the size of the whole earth，the biggest ocean does not seem big at all.
A．Compare
B．When comparing
C．Comparing
D．When compared
嘉靖三彩
