[单项选择]What does the man mean A. The library no longer had the book on reserve. B. The library closed earlier than he’d expected. C. The professor bad chosen a mystery book for him instead. D. The homework assignment isn’t clear.
参考答案:B 答案解析:[听力原文] W: Were you able Io use the book that Dr. Nelson put on reserve for our homework M: No
第6题: [单项选择]表示检测方法或检测仪器测定某物质的敏感程度即()。 A. 差异度 B. 变异度 C. 灵敏度 D. 精密度 E. 准确度 参考答案:C 答案解析:1.准确度指在一定实验条件下多次测定的平均值与真值相符合的程度,以误差来表示。2.精密度是指多次重复测定同一量时各测定值之间彼此相符合的程度。表征测定过程中随机误差的大小。
第7题: [单项选择]粉末遇碱液显红色的药材是 A. 蓼大青叶 B. 大青叶 C. 番泻叶 D. 紫苏叶 E. 侧柏叶 参考答案:C