Fire detection equipment - linear heat and multipoint smoke detectors and intermediate elements 火灾探测器材.线性热和多点烟探测器和中间元件
2.
1 . the study of algebraic structure and properties ( 1 ) some properties and structure of lattice implication algebra are discussed . it is proved that lattices with five elements and lattices with an intermediate element can not form lattice implication algebra except they are chains 一、代数结构和性质的研究1 、对格蕴涵代数的结构进行了研究，证明了非链的五元格不能构成格蕴涵代数，非链的中界格不能构成格蕴涵代数。
