A2造句 61. Conclusions Microsurgery through longitudinal fissure approach for A2 anterior cerebral artery aneurysms can get good results. 62. A1 and A2 sporangium proportion markedly affected the oospore formation quantity. The ratio 1:1 caused the largest production of oospores. 63. Some free virus scan utilities that are recommended are A2, Dr. Web and AVG.