Since it is used in different environment and with the discrepancy of product quality, the RTV coating used in different area has the problem of ageing and tenureofuse.
由于使用环境和产品质量的差异,不同地区使用的RTV涂料都存在着老化和使用年限的问题。
2
The right to use mineral resources is derived from its ownership by right oftenure into mineral resources prospecting and mining rights.
矿产资源的使用权是从其所有权派生出来的权利,矿产资源的使用权分为探矿权和采矿权。
3
Land tenure system comes into being on the precondition of the separation between land ownership and land use right.