题型:判断题 已知f(x)=logax(a>0,a≠1),设数列f(a1),f(a2),f(a3),…,f(an)…是首项为4,公差为2的等差数列.(I)设a为常数,求证:{an}成等比数列;(II)设bn=anf(an),数列{bn}前n项和是Sn,当a=2时,求Sn. 查看答案
题型:判断题 女,65岁,冠心病心绞痛史8年,无高血压史,夜间突发心前区疼痛8小时入院。入院时血压为150/90mmHg(20/12kPa),经心电图检查,诊断急性前壁心肌梗死此时最具特征性的实验室改变是()A.血清LDH水平增高B.血清GOT(AST)水平增高C.血清GPT(ALT)水平增高D.血清CK-MB水平增高E.血清肌红蛋白下降 查看答案
题型:判断题 To this happening again, John suggested that the source of all the water supplies .A, stop, be examined B, keep, should be examined C, prevent, examined D, stop, was examined 查看答案