已知两条直线a、b及平面α有四个命题:①若a∥b且a∥α则b∥α;②若a⊥α且b 发布时间:2017-05-15 12:46 │ 来源:www.tikuol.com 题型:选择题 问题: 已知两条直线a、b及平面α有四个命题:①若a∥b且a∥α则b∥α;②若a⊥α且b⊥α则a∥b;③若a⊥α且a⊥b则b∥α;④若a∥α且a⊥b则b⊥α;其中正确的命题是( )A.1B.2C.3D.4
题型:选择题 按要求改写句子。1. Will you please sing a song for us?(改为祈使句) ___________ a song for us.2. You should take some medicine if you have a cold. (对画线部分提问) ___________ I ___________ if I have a cold? 3. He is riding a bike now.(用yesterday afternoon改写) He ___________ a bike ____________.4. He did the laundry last night.(改为否定句) He ___________ the laundry last night.5. She has a headache.(对画线部分提问) ____________ with her? 查看答案