单项选择题
多项选择题 葡萄球菌蛋白A是一种单链多肽，与肽聚糖共价结合，能与多种哺乳动物 IgG Fc片段非特异性结合，其生物学作用有：A.趋化作用B.抗吞噬C.损伤血小板D.促进细胞分裂E.引发过敏反应F.内毒素作用
单项选择题 The analysis that we mostly work with is that of the n-channel device. For p-channel devices the transfer curve employed is the ________ image and the defined current directions are ________. ____