The concavebottom mill shoe is used to grind downhole small objects and other unstable fallen objects.
凹底磨鞋可用于磨削井下小件落物以及其它不稳定落物。
2
On seismic profile cross-cut the channel, it generally presents as a lenticle with flat top and concavebottom and has the character of infilling in reflection.
河道砂岩体在横切河道的地震剖面上一般表现为充填反射状的顶平底凹的单透镜体；
3
An adhesive dike slot (31) is formed around the joint concavebottom, thus preventing the main body and the neck back side from dirtiness caused by excessive adhesive overflow.