【判断题】sql是MySQL专用的数据库查询语言。( )
【单选题】关于单个自变量的检验与系数解读,以下说法错误的是
A.
t 检验是对单个自变量显著性进行检验的方法,其原假设为该自变量的系数为0
B.
定性变量的系数反映的是某一类别对因变量的绝对影响
C.
在进行系数解读时需要强调“控制其他因素不变”
D.
若定量变量有k种水平,则在回归结果输出表中会有k-1项系数估计结果,未显示的水平为基准水平
【简答题】以下MySQL语句中,已知关系模式student(Sno,Sname,S,Sage,Sdept,Passwords),查询在student表中的分组记录,正确的是( )。A. SELECT sdept,COUNT(*) AS 人数 FROM student GROUP BY sdept; B. SELECT sdept AS 专业,AVG(sage) AS 平均年...
【简答题】完形填空。 Once there was a very brilliant,creative and educated man. He gained much while traveling throughout the world. 1 he lost his legs and left arm in a tragic accident,leaving only a finger and thu...
【单选题】30岁,男性。30分钟前被刀刺伤右前胸部,咳血痰,呼吸困难。体检:血压107/78mmHg,脉搏96次/分,右前胸有轻度皮下气肿,右锁骨中线4肋间可见3cm长创口,随呼吸有气体进出伤口响声。该病人纵隔的位置是
【多选题】以下关于法院调解的说法错误的是( )。
A.
申请司法确认协议,可以由当事人一方或双方共同向基层人民法院提出
C.
有关买卖合同纠纷的调解协议发生效力后,有关买卖争议的诉讼关系消失
D.
法院送达调解书时发现与达成的调解协议不一致时,法院应将原调解书收回,重新制作并送达
【简答题】完形填空。 A young man was going to 1 his holiday in a mountain village. That night he stayed at a small hotel near the train station. 2 going to bed, he went to the owner of the hotel and said, 'Excuse me...