图纸()位于图纸的右下角,说明工程名称和图纸内容并设有签字栏。A.会签栏 B.专业类 发布时间:2017-05-14 20:09 │ 来源:www.tikuol.com 题型:单项选择题 问题: 图纸()位于图纸的右下角,说明工程名称和图纸内容并设有签字栏。A.会签栏B.专业类别栏C.标题栏D.设计单位栏
题型:单项选择题 如图所示是“研究凸透镜成像”的实验图,若在透镜右边的光屏上(光屏未画)得到清晰缩小的实像,则蜡烛可能置于透镜左边a、b、c、d四点中的 点处, 机就是利用此成像特点制成的.想用凸透镜观察到一个正立的像,蜡烛应该放在 点处. 查看答案
题型:单项选择题 Not until _____ the exam _____ the importance of doing homework. A. had he failed; he realized B. he had failed; did he realize C. he had failed; he realized D. had he failed; did he realize 查看答案