This article confirms that the former is rational,and analyses the reason of their disputes from the archaeological material,unearthed material,and national minority customs points of view,gives a clearer elaboration about the small utensil needle of people s daily life.

At the same time,the improving measures of cutter head,pneumatically coming out of soil,reducing friction and so on were introduced emphatically.

Urban land leasing guided by controlled detailed planning;

Study on the target orientation of land leasing by local governments;

In our country,local governments use state-owned land leasing as the tool of maximizing land revenue and introducing investment,which put negative results on local public finance,land resource allocation and society stability.

Designing of screw conveyor for EPB pipe-jacking tunneling machine;