若,则角终边所在象限是 A. 第一或第二象限 B. 第一或第三象限C. 第二或第三象限 D. 第三或第四象限 答案:【答案】D【解析】利用同角三角函数基本关系式可得,结合正切值存在可得角终边所在象限.,且存在,角终边所在象限是第三或第四象限.故选:D.
给句子选择合适的词语。(只填序号)
A. am not B. are C. do not D. is E. have F. does not1. It _______________ her birthday today.2. I _______________ many friends at school.3. She _______________ like stamps very much.4. I _______________ a middle school student.5. They _______________ having Chinese class now.6. We _______________ know how to get there.