下列是飞蚊症的主要病因的是 ["A.玻璃体液化","B.增生性玻璃体视网膜病变","C.玻璃体积血","D.玻璃体后脱离"]
对某土体进行室内压缩试验,当法向应力p1=100kPa时,测得孔隙比e1=0.62,当法向应力p2=200kPa时,测得孔隙比e2=0.58,该土样的压缩系数a1-2、压缩模量ES1-2分别为: ["0.4MPa-1、4.05MPa","-0.4MPa-1、4.05MPa","0.4MPa-1、3.95MPa","-0.4MPa-1、3.95MPa"]
与玻璃体液化有关的是 ["A.炎症","B.外伤","C.近视","D.青光眼"]
治疗睫状环阻滞性青光眼应使用 ["A.匹罗卡品充分缩瞳","B.阿托品充分麻痹睫状肌","C.静脉滴注甘露醇","D.必要时可抽吸玻璃体"]
简述管理的性质和管理职业素质。?
试述管理学的研究对象与内容。