The top plug has a solid body that provides positive indication of contact with the landing collar and bottom plug through an increase in pump pressure.

顶塞具有一个实心的塞体，根据泵压的增加它能可靠地显示与止塞箍和底塞的接触。

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There is a whole area here on the main floor where you can bring a laptop and plug it in for power but on top of that we also have a connection for the internet at every seat.

在主楼层这里有一片很宽敞的区域可供使用笔记本电脑，也可以给电脑充电。并且，我们所提供的网络连接可以覆盖到馆内的每一个座位。

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How do we get rid of z? Well, if we are on the top surface, z So, I plug z equals z2 of x, y into the formula for R, whatever it may be.

怎样才能消去z？，考虑顶部曲面，通过函数z2给出。，z，is，given，by，this，formula，，z2，of，x，，y。,所以我把z=z2代入到R中，不管是什么。

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With a maximum electric-only speed projected to top that of Prius plug-in, C-MAX Energi drivers might be able to reach wherever they're going a little faster, too.

ENGADGET: Ford's 2013 C-Max Energi rolls out 95 MPGe, arrives later this fall

C-MAX Energi delivers a projected 550 miles of total range, a 95 mpg equivalent (MPGe) and an electric-only top speed higher than the Prius plug-in.

ENGADGET: Ford C-Max Energi pricing: $29,995 after a federal tax credit, available this fall

This is usually a mechanical plug with cement poured in on top.

FORBES: The Fracking Solution Is A Good Cement Job