题目

指出在使用下列仪器（已经洗涤干净）或用品时的第一步操作：（1）石蕊试纸（检验气体）： （2）容量瓶： ．（3）酸式滴定管： （4）集气瓶（收集氯化氢）： 答案：【1】把试纸用蒸馏水湿润【2】检查容量瓶是否漏水【3】检查滴定管是否漏水；【4】干燥集气瓶根据句意从方框中选出合适的动词或动词短语, 用其适当的形式完成句子。 take off set up base… on go through come up give in punish blow up 1.My grandfather ____________________ a long illness before he breathed his last.2.The past two years have seen the app he developed really_______________ and made him a millionaire.3.The research group produces two reports _______________ the survey, but neither contained any useful suggestions.4.It is always the elder brother who __________________ first when a quarrel breaks out between the two brothers.5.Whoever breaks the law won’t escape _____________________.6.His name _____________whenever the problem of nuclear energy was discussed.7.According to today’s newspaper, the escaped prisoner threatened to _____________ the police station in the near future.8.It was requested that a fund ________________for the dead men’s families.