The study results showed that the effect of density on laminar bottom in elevation difference pipeline is distinct and can not been ignored.

An intermixing model of elevation difference batching transportation is established.

Six new faults have been discovered in addition to modifying the location and drop of the original faults,furthermore,a better grasp of the distribution,the development status,the scope and the stretch of all the faults in opencast coal mine are available, which will give a much more reliable geological gu.

The feasibility research on two-cavity in one mould to simple forgings,forgings with a big section difference and forgings with drop is concerned in the paper.

In free status, dry shrinkage of expansive concrete with expansive agent is the same with common concrete; in restrain status, compressive stress is the main reason causing dry shrinkage fall increasing in expansive concrete; the technical measures which are effective for reducing common concrete dry sh.

The industrial experiment and research have been made to air delivery of cement(flyash) with a large fall.

A New Method of Predicting throw and Strikeextended Lenghth of Coal Fault;

For the stage-discharge relation influenced by the soar or fall rate of flood, the water tipping of the downstream as well as the artificial hydraulic engineering, a method, which is called adjusting factor-fall exponent method based on computer synthesizing, has been put forward.