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（    ）零件通常由工作部分、支承部分及连接部分组成，形状比较复杂且不规则，零件上常有叉形结构、肋板和孔、槽等。
A、轴套类
B、盘盖类
C、叉架类 
D、箱体类

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未知题型
If I had the ability to change one thing about American society, my decision would not be a difficult onE.I would ban television.
I grew up a couch potato. Looking back, it seems I hardly read anything else at all—I watched TV almost seven hours a day.
There are so many good reasons for you to be a couch potato. Television is good before-breakfast entertainment. Television is good after-school entertainment. Television is good before-bed entertainment. Everybody watches it, so you have to watch it too in order to talk about it with friends. Otherwise you cannot say a word, which makes you look like an idiot.
But when I stopped watching television completely several months ago, I found that I had become a more reflective person, simply because I had more time to think. Television had stopped stuffing its ideas into my heaD.I was thinking of my childhood, and to my disappointment, I found that it could be summed up adequately in one sentence: “I watched a lot of TV. ” And I wast much of my youth that I cannot have back. I will never be more imaginative than I was in my childhooD.
Now I can totally resist the temptation of TV no matter how marvelous the programs are, and I’m entering into a new stage of lifE.In the meantime, I ’d hope that all couch potatoes would turn off their TV. But I am afraid that with more and more attractive TV programs , I ’m not going to be the last person in this country to idle awaythe best years of life sitting passively in front of a television.
A couch potato is someone who ______.
A.spends much time sitting and watching TV
B.plants potato
C.plants potato in the couch
D.sits in a couch eating potato
People watch TV so much because ______.A.television is good before breakfast entertainment
B.television is good after-school entertainment
C.television is good before-bed entertainment
D.All of the above
According to the passage, people will ______ if they stop watching TV.A.fill themselves with idea on TV
B.be more lazy and relaxed
C.have more time to think
D.not look back at their childhood
Which of the following is NOT true of the author?A.The author had watched television a lot.
B.The author had wasted too much of his youth.
C.The author will never be more imaginative than he was in his childhooD.
D.The author is determined to go on watching television.
The phrase “idle away” (ParA.5) probably means “______”.A.spend time in a different way
B.spend time in a relaxed way
C.enter a new stage
D.watch television
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未知题型
某初产妇，会阴侧切顺娩一活男婴，产后第4天，体温40℃，伴脉速，头疼，下腹疼痛，恶露有臭味，会阴切口红肿，双乳软，无硬结。
该产妇诊断为
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