在多轴加工中,如果球刀的轴线从垂直于被加工表面变为与被加工表面呈倾斜状态,则刀具接触

题型:单项选择题

问题:

在多轴加工中,如果球刀的轴线从垂直于被加工表面变为与被加工表面呈倾斜状态,则刀具接触点处的切削速度与原来相比将()。

A、增大

B、减小

C、不变

D、不能一概而论应视具体情况而定

考点:加工中心操作工考试高级加工中心操作工高级加工中心操作工题库
题型:单项选择题

Reading is the key to school success and,like any skill,it takes practice. A child learns to walk by practicing until he no longer has to think about how to put one foot in front of the other. An excellent sportsman practices until he can play quickly, correctly and without thinking. Educators call it “automaticity(自动性)”.

A child learns to read by sounding out the letters and finding the meaning of the words. With practice, he stumbles less and less, reading by the phrase. With automaticity, he doesn’t have to think about the meaning of words, so he can give all his attention to the meaning of the text.   

It can begin as early as first grade. In a recent study of children in Illinois schools, Alan Rossman of Northwestern University found that automatic readers in the first grade not only read almost three times as fast as the others, but also got better results in exams.

According to Rossman, the key to automaticity is the amount(数量)of time a child spends reading, not his IQ. Any child who spends at least 3.5 to 4 hours a week reading books, magazines or newspapers will probably reach automaticity. It can happen if a child turns off TV just one night for reading at home.

You can test yourself by reading something new which is suitable for your level. If you read aloud with expression, with a sense of the meaning of the sentences, you probably are an automatic reader. If you read brokenly, one word at a time, without expression or meaning, you need more practice.

小题1:“ Reading is the key to school success” means that reading______.

A.helps school develop faster

B.is a key to a successful school

C.helps students go to a key school

D.can improve students’ learning results小题2:Children with “automaticity” can read faster because they______.

A.know how to read the words

B.do not have to think while reading

C.read by themselves without any help

D.pay attention to the meaning of the text小题3: The underlined word “stumble” in the passage means “______” in Chinese.

A.结结巴巴地读

B.全神贯注地读

C.心不在焉地读

D.声情并茂地读小题4:The best title for the passage is “______”.

A.IQ is the Key to the Automaticity

B.TV is Bad for Children’s Reading

C.Automaticity Depends on Practice

D.Automatic Readers Will Be Successful

题型:单项选择题

利用渗透作用实验原理可以测定细胞液浓度的大概范围。将细胞液浓度相同液泡大小相同的某种植物细胞(如下图所示),置于不同浓度的蔗糖溶液中,出现a~d四种细胞状态,则细胞液浓度最精确的范围在下列哪两个细胞之间

[ ]

A.b~d

B.a~c

C.a~d

D.d~c

题型:单项选择题

投资控制流程可细化分为几个流程图,但不包括( )。

A.初步设计阶段投资控制工作流程图

B.施工图阶段投资控制工作流程图

C.施工阶段投资控制工作流程图

D.竣工阶段投资控制工作流程图

题型:单项选择题

秦朝废除传统的分封制,实行郡县制()

题型:单项选择题

小儿易患疳病的原因是

A.脏腑娇嫩
B.发育迅速
C.肺常不足
D.脾常不足
E.肾常虚

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