第23题:[单选题][T]B-C-B-020 4 2 2 裂解炉对流段炉管可能发生露点腐蚀,从原理上讲,露点腐蚀应该属于( )。 A. 酸性腐蚀 B. 碱性腐蚀 C. 氢腐蚀 D. 电化腐蚀 参考答案:A
第24题: [单项选择]室内质控图中控制限为平均值±2s表示() A. 95.45%的质控结果在此范围之内 B. 99%的质控结果在此范围之内 C. 99.7%的质控结果在此范围之内 D. 68.27%的质控结果在此范围之内 E. 90%的质控结果在此范围之内 参考答案:A 答案解析:根据正态曲线下的总面积为1或100%,μ±1σ的面积占总面积的68.2%;μ±2σ的面积占总面积的95.5%;μ±3σ的面积占总面积的99.7%的分布规律。室内质控图中控制限为平均值±2s表示95.4
第33题: [单项选择]Passage Three Questions 32 to 35 are based on the passage you have just heard.A. Because they have a quicker response. B. Because they are usually more strongly built. C. Because they seem to be men of greater endurance. D. Because they have a better sense of space. 参考答案:D 答案解析:[解析] Why are there more left-handed athletes