题目内容

21.男性,70岁,腹部疼痛6天,以右下腹为重,伴呕吐。检查:急性病容,右下腹饱满压痛,肌紧张,血白细胞14.5×109/L,腹部透视可见少量气液平面。诊断绞窄性肠梗阻最可靠的依据是( )

A. 阵发性腹部绞痛
B. 有气过水音和金属音
C. X线检查小肠有多个阶梯状液
D. 频繁呕吐,呕吐物为胃肠液
E. 腹肌紧张,有压痛和反跳痛

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一次重定向过程中,浏览器会发出多少次服务器请求( )

A. 1
B. 2
C. 0
D. 3

阅读下面代码片段:‎Servlet1:‎request.setAttribute("username", "张三");‎String username=(String) request.getAttribute("username");‎System.out.println("username:"+username);‎request.setAttribute("username", "李四");‎username=(String) request.getAttribute("username");‎System.out.println("username:"+username);‎request.removeAttribute("username");‎username=(String) request.getAttribute("username");‎System.out.println("username:"+username);‎当使用浏览器访问Servlet1时控制台会输出什么结果‎

A. username:李四username:李四username:null
B. username:张三username:李四username:null
C. username:李四username:nullusername:null
D. username:nullusername:nullusername:null

下列选项中,属于HttpServletResponse类中发送状态码的方法是()

A. setStatus(int status)
B. setStatus(String status)
C. sendError(String status)
D. sendError(int status)

下面选项中,服务器发送数据不会产生乱码的是( )

A. response.getOutputStream().write(“中国”.getBytes(“utf-8”));
B. response.getWriter().write(“中国”);
C. response.setCharacterEncoding(“utf-8”);response.setHeader(“Content-Type”,”text/html;charset=utf-8”);response.getWriter().write(“中国”);
D. response.setContentType(“text/html;charset=utf-8”);response.getWriter().write(“中国”);

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