第1题: [单项选择]Planet "Y" orbits the Sun in six months. AB is four times the distance of CD and moreover it turns out that planet X travels at haft the speed of planet Y. How long does Planet "X" take to orbit the Sun A. 8 years. B. 6 years. C. 4 years. D. 2 years. 参考答案:C 答案解析:由题意可知AB=4CD,故x绕太阳一周的距离为Y的4倍,又planet X travels at half the speed of planet Y,故x绕太阳一周的时间为Y的8倍。Planet Y
第2题:[单选题]采集血培养标本时的注意事项哪项错误: A. 采后立即送验 B. 严格执行无菌技术操作 C. 抽血前检查培养基是否符合要求 D. 一般采血 2ml E. 检查容器有无裂隙 参考答案:D