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问题 单项选择题

临床实验室若对检测系统进行性能核实，需要进行哪些实验

A．精密度、灵敏度、特异性
B．精密度、准确度
C．准确度、灵敏度
D．准确度、灵敏度、特异性
E．精密度、准确度、结果可报告范围

答案

参考答案：B

单项选择题

A client is scheduled to undergo percutaneous transluminal coronary angioplasty (PTCA). The nurse explains the procedure to the client. Which of the following statements by the nurse is most appropriate

A. "PTCA involves opening a blocked artery with an inflatable balloon located on the end of a catheter. "
B. "PTCA involves cutting away blockages with a special catheter. "
C. "PTCA involves passing a catheter through the coronary arteries to find blocked arteries. "
D. "PTCA involves inserting grafts to divert blood from blocked coronary arteries. "
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填空题

下面程序运行时输出结果为 C:\Program Files is a directory. 请将程序补充完整。 import java.io.*; public class DirTest { public static void main(String[] args) { File myDir = new File("C:/Program Files/"); System.out.println (myDir+( 【11】 .isDirectory()"is": "is not") +" a directory."); } }
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