[单项选择]关于数字万用表的使用方法错误的是:() A. 在测量当中注意不要用表笔直接测量线路比较密集的器件,以防将板子无意间短路而损坏集成块,而应选择和其等电位的线路稀疏的地方测量 B. 测量直流电压和直流电流时,读数为正或者负值都是正常的,正负的测量误差都是一样的 C. 在测量某一电量时,不能在测量的同时换档,尤其是在测量高电压或大电流时,更应注意。否则,会使万用表毁坏。如需换档,应先移开表笔,换档后再去测量 D. 万用表不用时,不要旋在电阻档和电流档,可防止直接去测电压而损坏万用表.应将转换开关置于交流电压的最大挡
第4题: [单项选择]The 100-page-long leaflet the man speaker got at Oslo Airport contains________. A. funny information about restaurants B. quite boring information about restaurants C. totally useless information about restaurants D. insufficient information about restaurants 参考答案:D
第31题: [单项选择]The last month report parallels that on the Alar apple scare in that ______. A. neither really caused worry among the public B. neither underwent a scientific peer review C. neither provided statistical supports D. neither aimed for the public good 参考答案:B 答案解析:由Like its predecessor 10 years earlier, the Consumers Union report received no legitimate scientific