机械工业中,润滑油的种类很多,可概略为()大类。A、2 B、3 C、4 D、5

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问题:

机械工业中,润滑油的种类很多,可概略为()大类。

A、2

B、3

C、4

D、5

考点:高级维修电工高级维修电工题库
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路面菱形块虚线警告前方道路要减速慢行。

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某桩为钻孔灌注桩,桩径d=850mm,桩长L=22m,如图所示,由于大面积堆载引起负摩阻力,试按《建筑桩基技术规范》(JGJ 94—2008)计算下拉荷载标准值(已知中性点为Ln/L0=0.8,淤泥质土负摩阻力系数ξn=0.2,负摩阻力群桩效应系数ηn=1.0)。

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下面给出的四个命题中,是假命题的是(  )

A.如果a=3,那么|a|=3

B.如果(a-1)(a+2)=0,那么a-1=0或a+2=0

C.如果x2=4,那么x=2

D.如果四边形ABCD是正方形,那么它是矩形

题型:单项选择题

Reading comprehension.

     Students often meet with questions as follows: bullied by someone, worried about a weak subject, puzzled

by family problems or concerned about pets at home. All the questions above may make you not concentrated

on your study. Who can you turn to if you are such an unlucky student? A great person to share your thoughts

and feelings with is your school counselor (顾问).

     Add school counselors to the list of people you can turn to when you need help. They know how to listen

and can help kids with life's challenges (挑战). Counselors have special training in how to help kids solve

problems, make decisions, and stand up for themselves. That doesn't mean your counselor will wave a magic

wand and the problem will go away. But it does mean he or she will help you cope with it. Coping is an

important word to know. Sometimes, kids and grown-ups have difficult problems. Coping means that someone

is trying to handle these problems and make things better.

     Your school counselor is available for you and wants to make your school experience the best it can be. The

counselor's job is to take your problem seriously and help you find a solution. The counselor also wants to help

you learn as much as you can in class, be a contributing member of the school community, and be a positive

influence on your environment.

1. From the underlined sentence we may infer that ______.[ ]

A. a school counselor is one of those who can help you

B. school counselors are those you can make friends with

C. one needs various people to help him or her

D. one has to know and deal with all kinds of people at school

2. According to the passage, which of the following happens that you may not turn to the counselors? [ ]

A. Other students treat you cruelly.

B. You are too poor to go to school.

C. You are weak in one subject.

D. You have family problem.

3. What does the writer think of the school counselors?[ ]

A. They can solve any questions you meet with.

B. They can help students get their life or study improved.

C. They are as important as teachers in schools.

D. They may punish those who have bullied you.

4. Which of the following may be the best title of the passage?[ ]

A. School counselors

B. School problems

C. Students' problems

D. Free counselors

题型:单项选择题

患者从高坡上跌落四肢不能活动,检查:手骨间肌、蚓状肌无力,肱三头肌腱反射消失;双下肢瘫痪,各种反射消失。

轴突反射是皮肤感受器接受刺激后,传入冲动,达到作用部位的途径是()

A.经由传入神经传入,经传出神经逆行传送到效应器

B.经由传入神经进入脊髓再经传出神经传送到效应器

C.经由轴突反射作用于全身

D.经由轴突反射作用于皮节

E.经由轴突反射作用于对侧相应部位

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