第4题: [单项选择]男,45岁。疲乏、贫血4个月入院。既往有乙型肝炎病史10年。查体眼结膜略苍白,腹软,可见腹腔静脉曲张,肝肋下未触及,脾脏肿大,移动性浊音阳性,血PLT50×10/L,血小板减少最可能的原因是:()。 A. 营养不良 B. 溶血 C. 骨髓抑制 D. 脾功能亢进 E. 出血 参考答案:D 答案解析:结合患者乙肝病史,及贫血、脾肿大、腹水、血小板低等特点,考虑门脉高压症,脾功能亢进。
A. They are balanced by the pressure of rain droplets. B. The effect of gravity at high altitude is random. C. They are kept in the sky by air current. D. They are moving about with fixed direction. 参考答案:C