第1题: [单项选择]Mary has got a furl mark in the test. She ______ very hard all the time. A. will work B. must have worked C. may work D. could have worked 参考答案:B 答案解析:[解析] must have done表示对过去情况的推测,例如:Her eyes are red. She must have been crying。(她的眼睛红了,一定是哭过了。)D项could
第25题: [单项选择]基本视图是() A. 物体向不平行于任何基本投影面的平面投射所得的视图 B. 将物体的某一部分向基本投影面投射所得的视图 C. 物体向基本投影面投射所得的视图 D. 假想将物体的倾斜部分绕其自身的回转轴线旋转到与某一选定的基本投影面平行后再向该投影面投射所得的视图 参考答案:C