The concept of L-fuzzy perfect mappings based on the N-compactness is introduced. We show that the L-fuzzy perfect mappings are multiplicative.
本文以良紧性理论为基础引入了L-不分明完备映射的概念，证明了这种映射是可乘的。
The blackening film with better brightness has better corrosion resistance and compactness and strong adhesive force. It is a perfect blackening agent.
发黑膜层与基体结合力强、耐蚀性高、致密性好且色泽光亮，是一种理想的钢铁防锈发黑剂。
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