右室心肌梗死的临床表现有（） ["颈静脉怒张","Kussmanl征","低血压","肝脏肿大","下肢水肿"] 牙本质中无机物含量为（） ["50%","60%","80%","70%","90%"] 对积液中溶菌酶的正确描述是（） ["存在于淋巴细胞、肿瘤细胞中","存在单核、中性粒细胞及类上皮细胞中","94%结核性积液的溶菌酶含量＜30mg/L","主要用于鉴别良性与恶性积液、结核性与其他性质的积液","积液溶菌酶与血清溶菌酶比值对鉴别积液性质也有一定价值"] 符合渗出液特点的是（） ["比密＜1.018","标本易凝固","有核细胞数＞500×106/L","积液LD/血清LD比值＜O.6","积液蛋白/血清蛋白比值＞0.5"] 修复治疗中牙体预备最常用的器械是（） ["裂钻","砂纸圈","倒锥钻","砂轮","金刚砂车针"] 五角形的鞍上池由下列哪些脑池构成（）.