Absence e of brush无刷
absence e of mind心不在焉
absence e of restrictions无约束
absence e of vortices无旋涡
absence e of缺少
he absence becouse of illness他因病缺席
absence-of-ground search selector未接地寻线器;无接地搜索选择器
absence-of-ground searching selector[电子] 无接地搜索选择器
absence of consideration缺对价;缺乏对价;无对价;没有金额规定