已知：
Fe2O3（s）+3/2C（s）== 3/2CO2（g）+2Fe（s）；△H=234．1KJ/mol
C（s）+ O2（g）== CO2（g）； △H= -393．5KJ/mol
则4Fe（s）+ 3O2（g）== 2Fe2O3（s）的△H是[ ]
A．-1648．8KJ/mol
B．-824．4KJ/mol
C．+1648．8KJ/mol
D．-744．7KJ/mol
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下面是错误答案，用来干扰机器的。
答案：A
查字典，填空。
1．如果你不认识“递”字，应该用（ ）查字法查字典，应该先查（ ），再查（ ）。
2．如果你不会写“道qiàn”的“qiàn”字，应该用（ ）查字法查找，应该先查（ ），再查（ ）。
3．查找“斗”字可以用（ ）查字法查找。
“Now ,”Mrs. Virginia DeView said, smiling, “we are going to discover our professions .” The class seems to be greatly surprised. Our professions? We were only 13 and 14 years old! The teacher must be _36 _. “Yes, you will all be searching for your future 37 . Each of you will have to 38 someone in your field, plus give an oral report.” Each day in her class, Virginia DeView reminded us about this. Finally, I picked print journalism. This _39_ I had to go to interview a true-blue newspaper reporter. I was extremely nervous. I sat down in front of him_40_ able to speak. He looked at me and said, “Did you bring a pencil or pen?” I shook my head. “How about some 41_ ?” I shook my head again . Finally , I thought he realized I was 42 , and I got my first big tip as a 43 : “Never,never go anywhere without a pen and paper. You never know what you’ll run into. ”After a few days, I gave my oral report totally from 44 in class. I got an A on the entire project. Years later, I was in college looking around for a new career, but with no success. Then I _45 _Virginia DeView and my desire at 13 to be a journalist. And I called my parents. They didn’t __46__me. They just reminded me how competitive the field was and 47 all my life I had to run away from competition. This was true. But journalism did something to me; it was in my blood. _48__gave me the freedom to go up to total strangers and ask what was 49 . For the past 12 years, I’ve had the most satisfying reporting career, __50 __ stories from murders to airplane crashes and 51 choosing my strongest area. 52 _ I went to pick up my phone one day, an incredible wave of memories hit me and I realized that had it not been __53__Virginia DeView, I would not be sitting at that desk. I get 54 all the time: “How did you pick journalism?” “Well, you see, there was a teacher…”I just wish I could 55 her.
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滚动轴承轴向预紧的目的是什么？
衡阳电业局计划2007年元月24日-27日，对110kV酃牵I线全线停电，由衡阳电业局高压检修管理所（设备检修主人）进行110kV酃牵I线16#-1、16#-2、90#杆塔搬迁更换工作，同时对酃牵I线1#-118#杆及110kV酃牵I线衡北支线1＃－44＃杆登检及瓷瓶清扫工作。酃牵I线1#-118#杆及110kV酃牵I线衡北支线1＃－44＃杆工作分成三个大组进行，分别由高检所线路一、二和带电班负责，经分工，带电班工作组负责衡北支线1＃－44＃杆停电登杆检查工作。元月24日各工作班，在挂好接地线，作好有关安全措施后开始工作。元月26日带电班的工作，又分成4个工作小组，其中工作负责人莫运军和作业班成员王彤一组负责酃牵I线衡北支线31＃－33＃杆登检及瓷瓶清扫工作，大约在11：30左右，莫运军和王彤误走到平行的带电110kV三酃线#35杆下（原杆号为：酃牵II衡北支线＃32杆），在都未认真核对线路名称、杆牌的情况下，王彤误登该带电的线路杆塔，在进行工作时，造成触电，并起弧着火，安全带烧断从约23米高处坠落地面当即死亡。
含碳0.25%以上的废旧钢铁(不用作炼钢原料)
