题目

阅读理解 Jimmy is an automotive mechanic, but helost his job a few months ago. He has good heart, but always feared applyingfor a new job. One day,he gathered up all his strength and decided to attend a job interview. Hisappointment was at 10 am and it was already 8:30. While waiting for a bus tothe office where he was supposed to be interviewed, he saw an elderly manwildly kicking the tyre of his car. Obviously there was something wrong withthe car. Jimmy immediately went up to lend him a hand. When Jimmy finishedworking on the car, the old man asked him how much he should pay for theser下列有关实验的说法正确的是A. 蒸馏实验中温度计的水银球应该插入液态混合物中B. 测定未知NaOH溶液浓度时,锥形瓶应用标准碱液润洗2~3次C. 硫酸铜晶体中结晶水含量测定时,需用小火缓慢加热,防止晶体飞溅、防止硫酸铜变成其他产物D. 向试管中滴加试剂时,将滴管下端紧靠试管内壁
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