The process of multiple-state maintenance for the aviation ordnance synthetic system is studied, and a mathematical semi-Markov model is established.
以航空军械综合系统的多状态维护过程为研究对象，对其建立了半马尔可夫的数学模型。
INTECH COOLANT al 18 is a chlorine-free high performance, semi synthetic water-soluble metalworking fluid, specially designed for Aluminium manufacturing.
INTECH COOLANT AL 18是一种不含氯的高性能半合成水溶性切削液，特别为铝及铝合金的切削加工而设计。
Core spun yarn is produced by covering an elastic, rigid or semi-rigid filament with a natural, artificial or synthetic textile fibre.
在弹性、刚性或半刚性纤丝上覆盖一层天然、人工或合成纤维，就可以生产出包芯纱。
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