试述煤矿机械常用链传动的种类及主要优缺点?

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问题:

试述煤矿机械常用链传动的种类及主要优缺点?

考点:矿井维修钳工(初级)矿井维修钳工(初级)题库
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关于x的方程ax2+bx+c=0是一元二次方程的条件是(  )

A.c为任意实数

B.b不同时为零

C.a取不为零的实数

D.a取大于零的实数

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在行政诉讼中被告不得自行收集证据。()

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The worker I hired to repair my house had just finished a difficult first day on the job. A broken wheel made him an hour late; his ladder (梯子) fell down when he was painting the roof and now his old truck wouldn' t start. With each problem he shouted angrily, more at himself than at his things. As I drove him home, the man didn't say a word.

I tried talking to the man to kill time. I managed to find out that he had come up from Blue Hills in Victoria with his family six months ago to find a job. This was his first job since moving here. I now knew why his price was lower than any other worker I could find in the local newspaper. He really needed the job. His clothes told me as much.

On arriving, much to my surprise, he invited me in to meet his family. As we walked through his front garden he suddenly stopped at a small tree and placed his hands on it. Then, when he opened the door he completely changed. Instead of his troubled face, there was now a warm smile, hugs for his two children and a kiss for his wife.

The following day, I asked him about the tree.

"That's my trouble tree," he answered. "Work troubles aren't welcome at home with my wife and the children. So I hang them on that tree every night when I come home. Then in the morning I pick them up again. "

"And you know what else?" he said smiling,"The next morning I find that there aren't as many as I remember hanging up the night before. "

小题1:Which of the following things did NOT happen to the worker?

A.His truck broke down.

B.He was late for work.

C.He fell onto the roof.

D.His ladder fell down.小题2:When did the worker first arrive in this town?

A.Today.

B.Last night.

C.Six weeks ago.

D.Six months ago.小题3:Where did the writer find the worker?

A.Through a newspaper.

B.Beside the trouble tree.

C.In his old house.

D.In Blue Hills, Victoria.小题4:Why did the worker touch the tree?

A.To get good luck,

B.To leave his trouble outside.

C.To send good wishes to his family.

D.To clean his hands.小题5:What can we learn from the passage?

A.Looking for a job can make trouble.

B.It is important to get to work on time.

C.Often our problems are worse than what we think.

D.A happy family can make many problems go away.

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王某所在团队的领导非常关心员工的家庭生活,去年领导知道他的孩子逃学,并让他请假到学校去,后来还关心问孩子怎样了并对孩子取得学习上的进步表示高兴。这种领导属于()类型的领导。

A.爱管闲事

B.重视团队成员

C.干涉他人生活

D.顾问

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血精,选择的治则应为()。病案:患者男性,26岁,结婚1年,主诉性交时排出精液,呈淡红色,伴射精时疼痛,腰膝酸软,头晕眼花,夜间盗汗,心烦口干,舌红少苔,脉细数。化验精液红细胞满视野,B超提示:精囊炎性改变。诊断为血精。

A.温经通络、凉血止血 

B.滋阴泻火、凉血安络 

C.温肾补阳、化痰散结 

D.化痰散结、化瘀止血 

E.滋阴清热、凉血止血 

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