[名词解释] 生物硝化反应

战争形态 世界上第一本完整论著写实主义的专著是？（） ["论文学","小说精髓","论写实主义","小说原理"] 必须是机械式的制动器是（）。 ["行车制动","驻车制动","液压制动","气压制动"] 在工程图样中，画尺寸线应采用的线型为（） ["细虚线","细实线","粗实线","粗虚线"] Which three of these are types of Ethernet Virtual Connections （EVCs） in the MEF concept？ （） ["rooted multipoint EVC （E-Tree）","point-to-point EVC （E-Line）","point-to-multipoint EVC （E-Tree）","hub spoke EVC （E-Tree）","multipoint-to-multipoint EVC （E-LAN）"] 生物硝化反应