在寻求友谊的过程中,应引起大家注意并避免的问题是( )
①言而有信。②讲“哥们义气”。③以我为中心。④因自己某方面优越而看不起别人。
A:①②④
B:①②③
C:②③④
D:①④
A: Hello, Mike.
B: Hello, Lucy.
A: ____
B: I'm feeling better now.
B: He said I had got a bad cold.
B: No, I can't. I have to stay in bed for a few days.
B: Could you help me with my lessons when I am well?
A: Sure. ____
B: Thank you.
A. What's wrong with you?
B. I hope you'll be better soon.
C. Can you come to school today?
D. How are you today?
E. I'm sorry to hear that.
F. What did the doctor say?
G. Are you feeling better now?
(Ⅰ)求证:直线DM是⊙O的切线;
(Ⅱ)求证:DE2=DF•DA.
夏季车辆长途行驶时,车胎内气体温度最高可达77℃.某型号轮胎说明书上标注的最大胎压为3.5×105Pa.若给该轮胎充气时,胎内气体温度恒为27℃,不计充气及车辆行驶时车胎体积的变化,为了保证行车安全,该轮胎刚充完气的气压不应超过多少?
如下图是隋朝大运河示意图。结合图完成下列问题。