在地球上,一年中正午物体的影子始终朝北的是[ ] A、南回归线与南极圈之间 B、 发布时间:2017-05-13 00:06 │ 来源:www.tikuol.com 题型:选择题 问题: 在地球上,一年中正午物体的影子始终朝北的是[ ]A、南回归线与南极圈之间 B、南北回归线之间 C、南北回归线至南北极圈之间 D、北回归线至北极圈之间
题型:选择题 用方框中所给词的适当形式填空,使短文回复完整。flower, rest, feel, nothing, eat, health, wait, tell, say, manyThis is the doctor’s waiting room. It is full of people. They are _小题1:___ to see the doctor. Mrs. Brown is小题2:______ the doctor something about herself. She says when she plants some _小题3:_____ in the garden. She has to sit down and ___小题4:____every five minutes, because she ____小题5:____ too tired. The doctor tells Mrs. Brown there is _小题6:____ much wrong with her after she looks her over 检查 carefully. She says Mrs. Brown _小题7:_____too much but she doesn’t take enough exercise. So the doctor __小题8:___, If you want to be __小题9:___, you must eat less food and take ___小题10:___ exercise. 查看答案
题型:选择题 (8分)下图是实验室常用的气体发生和收集装置,请回答下列问题:①写出所指仪器的名称:a ,b ;②若用加热KMnO4制取O2,你应该选择的发生装置是: (填字母,以下同),要得到较纯净的氧气,收集装置应选: ;若用双氧水制取O2,应选用的发生装置是: ,反应的化学方程式是: 。③若用排水法收集实验完毕后,为了防止水倒流而引起试管炸裂,应先 ,然后 。 查看答案