题目

如图所示，所测物体长度为 ______ cm；选用精密的测量工具，改进测量方法等可以 ______（选填 “消除”或“减小”）误差。 答案：1.85减小 【详解】 [1]如图所示，刻度尺的分度值为 0.1cm，刻度尺的测量结果既要记录准确值又要记录估计值，所以所测物体长度为 1.85cm。 [2]误差只能减小，而不可能消除，故选用精密的测量工具，改进测量方法等可以减小误差。根据短文内容和括号内所给汉语意思 ,写出空白处各单词的正确形式(每空一词 ) 。More and more teenagers are using the internet nowadays, but some of them aren't using it in a proper way. If you follow these suggestions, it'll be much (安全的) than you might think.Do not give your password to others and never give out your home (地址)， real name, age, school or phone number to those (陌生人).Do not share your (私密的) information in Moments(朋友圈).Never answer unwanted (电子邮件).Be (小心的) when you are using public Wi-Fi or scanning QR code（扫二维码）.Never go and meet anyone you met online (没有) your parents' permission and never go (单独地).Keep a separate credit (信用) card just for (购物) online. This will make it easier to (取消) if something bad happens and your other credit cards can still be used uninfluenced.