Purpose It can reduce teeth preparation that the caries of distal neck of lower second molar are restorated with single cavity.

The construction method of Nanliang tunnel with double wire large span and single holes entering into double holes;

2 Line projects of Iron Teheran subway, the author analyzes disadvantages of “Rail Arrangement Method" in the rail construction for one-tunnel one-track subway projects and features of one-tunnel two-tracks subway projects, and provides a new construction method, in which engineers can directly place assembled rails on the structural base floor of tunnels as temporary tracks of rail flat-cars.

In accrodance with the characteristics of vuggy reservoirs,a basic idea for studying the flow law in this kind of media is put forward:this kind of vuggy reservoir system is decomposed into vug units and fracture units,the two kinds of units alternatively connect and consist of the total reservior system.

Chemical characteristics of underground water and development performance of fracture-cave units in Tahe Oilfield;

Relationship between oil and water in fracture-cave unit during the course of single-well flooding drive;

Partition of fracture-cave units of Ordovician reservoir in Block 4 of Tahe Oilfield;

In order to avoid the dense pile foundations of line-plot tall buildings,parts of metro tunnel need to be constructed by single cavern and double-layer.