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粒细胞是机体最重要的一类防御细胞，它的黏附作用是指（）

A、与血管内皮细胞上黏附分子的激活和相互作用

B、对炎症刺激可能产生定向运动，从而集中到炎症损伤部位

C、借助伸展的伪足向被吞噬物或颗粒周围延伸、包围，通过胞内的各种酶起消化作用

D、一种是通过脱颗粒作用释放出含有髓过氧化物酶等物质的初级溶酶体，加强对吞噬体的消化和杀菌性能，称为非氧杀菌；另一种是在吞噬作用时大量消耗氧所产生的高毒性的氧衍生物，而杀死捕获的细菌，称为依氧杀菌

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