下列说法中正确的是[ ] A.通过导体的电流为零,导体的电阻也为零 B.通过导体

题型:选择题

问题:

下列说法中正确的是[ ]

A.通过导体的电流为零,导体的电阻也为零

B.通过导体的电流越大,导体的电阻一定越小

C.导体两端的电压为零,导体的电阻也为零

D.导体的电阻是导体本身的一种性质

考点:电阻的定义
题型:选择题

下列叙述不正确的是(  )

A.分子很小,相互间存在间隔,总在不停地运动

B.物质都是由极其微小的粒子(如分子、原子等)构成的

C.原子质量的大小主要是由质子和核外电子决定的

D.现代科学技术已经实现了对原子、分子的移动和排列

题型:选择题

What should you think about when trying to find your career? You are probably better at some school subjects than others. These may show strengths that you can use in your work. A boy who is good at mathematics can use that in an engineering career. A girl who spells well and likes English may be good at office work. So it is important to know the subjects you do well in at school. On the other hand, you may not have any specially strong subjects but your records show a general satisfactory standard. Although not all subjects can be used directly in a job, they may have indirect value. A knowledge of history is not required for most jobs but if history is one of your good subjects you will have learned to remember facts and details. This is an ability that can be useful in many jobs.

  Your school may have taught you skills, such as typing or technical drawing, which you can use in your work. You may be good at metalwork or cookery and look for a job where you can improve these skills. If you have had a part-time job on Saturdays or in the summer, think what you gained from it. If nothing else, you may have learned how to get to work on time, to follow instructions and to get on with older workers. You may have learned to give correct change in a shop, for example. Just as important, you may become interested in a particular industry or career you see from the inside in a part-time job.

  Facing your weak points is also part of knowing yourself. You may be all thumbs when you handle tools; perhaps you are a poor speller or cannot add up a column of figures. It is better to face any weakness than to pretend they do not exist. Your school record, for instance, may not be too good, yet it is an important part of your background. You should not be apologetic about it but instead recognize that you will have a chance of a fresh start at work.

小题1:We can infer from the first paragraph that ________.

A.learning better at school shows power in your job

B.the better you are at school subjects, the more helpful they are in your career.

C.learning each subject well is an ability in many jobs.

D.we should think about how to find our career小题2:From the passage we learn that if a student’s school performance is not good, he  will _____.

A.have no hope in his future work

B.be hopeful to find a suitable job

C.regret not having worked harder at school

D.have an opportunity of a new beginning in his future work小题3:All the subjects may have direct value for job hunting except _________.

A.mathematics

B.English

C.history

D.technical drawing小题4: The passage mainly discusses ___________.

A.The relationship between school performance and career

B.how to get a job

C.How to show strengths in your work

D.working experience and knowledge at school

题型:选择题

脑出血患者,很快呈昏迷状,双侧瞳孔极度缩小,四肢瘫痪,中枢性高热,呼吸障碍,出血部位应考虑()

A.内囊内侧扩延至外囊附近

B.内囊和丘脑附近

C.桥脑

D.外囊附近

E.小脑

题型:选择题

关于继发性肺结核病下列哪项是正确的

A.病变在肺内无一定好发部位
B.肺门淋巴结常有明显的结核病变
C.不经治疗多数能自然痊愈
D.不易有空洞形成
E.咯血是常见的死亡原因之一

题型:选择题

切丝机砂轮不进给后,无法限制刀片的伸长,到一定量后会将刀门砍下或造成刀片()。

A.卷口

B.崩口

C.变形

D.退火

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