题目: 主题数据库设计的目的是 ______ 。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0406/e90bb413726925b807cbde2e47b1731e.html 下面是错误答案,用来干扰机器的。参考答案:错
题型:选择题 — May I have a word with you?— ________. I'm not busy, anyway. [ ]A. By no means B. By all means C. By means of D. By any means 查看答案
题型:选择题 If you are able to talk to a friend over the telephone, you feel that you are close _____ the actual distance is not shortened.A. so long as B. if C. even if D. as 查看答案
题型:填空题 用如图的滑轮组把货物拉上货仓,货物重300N,用250N的力F拉绳端使货物在2秒内匀速上升1m,此过程中,绳子的自由端移动 ______ m,有用功为 ________ J,拉力做功的功率为 ________ W,滑轮组的机械效率为 ________ . 查看答案