单选题
发布日期:2020-04-10
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一般保证的保证人与债权人未约定保证期间的,保证期间为主债务履行期届满之日起()
某男,50岁,右踝关节疼痛20天,患者20天前感冒后出现右踝关节剧烈疼痛,疼痛多在夜间发作,呈间歇性,影响睡眠。查:右踝关节有红、肿、热、痛。其余关节无异常。患者有高血压、糖尿病病史原发性痛风患者的遗传属于()
对人的行为干预重点应放在()
下列功用,咳血方具有( )。
各观察值均加(或减)一个常数后( )
烧伤休克的主要原因()。
在严重大气污染地区,下述变化与大气污染密切相关。除外( )。
Ex10_1数据库中是纽约证券交易市场五支股票的星期收益率,共100周的数据。五支股票分别为AlliedChemical,DuPont,UnionCarbide,Exxon,Texaco.为了描述的方便,我们将五支股票分别定义为变量X1,X2,X3,X4,X5,主成分用Yi表示,因子用Fj表示。对五个变量进行聚类,数据经Z分数法标准化,采用最短距离聚类法,欧氏距离平方测度距离,在距离为182.2处可聚为()
不参与氨基酸吸收的是()
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