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男性，55岁。双下肢行走不稳1年，双手发笨、不能持筷，排尿费力半年。查体：四肢锥体束征阳性，双侧T4以下针刺觉减退。颈椎X线平片见颈椎管狭窄，MRI见 C4-7脊髓腹背侧受压。该患者的诊断是

A. 脑血栓
B. 脊髓型颈椎病
C. 脊髓侧索硬化症
D. 脊髓肿瘤

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10件产品中有3个次品，每次从中取出一个产品同时放入一个正品，直至取到正品为止，试求抽取次数X的概率分布．

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已知X在(0，1)上服从均匀分布，求Y=-2lnX的概率密度．

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一男性，24岁，劳动中突然发生剧烈头痛、呕吐和意识不清。体检：浅昏迷，血压120/ 80mmHg，体温37℃，颈抵抗、颏胸距4横指，克尼格(Kernig)征阳性。右上眼睑轻度下垂，右眼球外展位，右侧瞳孔4mm，光反应迟钝，左侧瞳孔2mm，光反应灵敏。左肢体活动差，左侧巴宾斯基征阳性。诊断为蛛网膜下腔出血。克尼格征阳性，该项反射属于( )

A. 浅反射异常
B. 深反射异常
C. 病理反射
D. 脑膜刺激征
E. 以上都不是

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Sergeant Our police academy no longer requires its applicants to pass a physical examination before being admitted to the academy. As a result, several candidates with weak hearts arid high blood pressure have been admitted. Hence, we can expect our future police force to have more health problems than our current police force. Knowledge of each of the following would be relevant to determining the reliability of the sergeant’s prediction EXCEPT whether

A. police officer candidates are screened for high blood pressure before joining the police force.
B. the police officer candidates who are not healthy now are likely to be unhealthy as police officers.
C. graduates of the police academy are required to pass a physical examination.
D. the health of the current police officer candidates is worse than was the health of police officer candidates in the past.
E. a police officer’s health is a reliable indicator of the officer’s performance.

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男性，55岁。双下肢行走不稳1年，双手发笨、不能持筷，排尿费力半年。查体：四肢锥体束征阳性，双侧T4以下针刺觉减退。颈椎X线平片见颈椎管狭窄，MRI见 C4-7脊髓腹背侧受压。 该患者的诊断是

A. 脑血栓 B. 脊髓型颈椎病 C. 脊髓侧索硬化症 D. 脊髓肿瘤

10件产品中有3个次品，每次从中取出一个产品同时放入一个正品，直至取到正品为止，试求抽取次数X的概率分布．

已知X在(0，1)上服从均匀分布，求Y=-2lnX的概率密度．

男性，55岁。双下肢行走不稳1年，双手发笨、不能持筷，排尿费力半年。查体：四肢锥体束征阳性，双侧T4以下针刺觉减退。颈椎X线平片见颈椎管狭窄，MRI见 C4-7脊髓腹背侧受压。该患者的诊断是

A. 脑血栓
B. 脊髓型颈椎病
C. 脊髓侧索硬化症
D. 脊髓肿瘤