用于二维数控加工编程的最简便的建模技术是()A、线框模型B、面模型C、实体模型D、特

题型:单项选择题

问题:

用于二维数控加工编程的最简便的建模技术是()

A、线框模型

B、面模型

C、实体模型

D、特征模型

考点:数控车床工考试数控车床工考试题库
题型:单项选择题
小明在上学的路上,先以υ1的速度走完前一半路程,又以υ2走完后一半路程,则他在上学的全程中平均速度为(  )

A.υ=

B.υ=

C.υ=

D.υ=

题型:单项选择题

Eighteen kids died in the school bus accident in Gansu Province. It’s _____ one that I have ever heard of.

A.a very serious

B.a more serious

C.the most serious

D.the least serious

题型:单项选择题
阅读理解。

WE NEED
1.     Your NAME,YEAR of birth, HOME ADDRESS CITY/STATE/PHONE NUMBER,
      SCHOOL NAME
(and English teacher)and EMAIL ADDRESS so we can email you if you're
      published.     
        For photo, place the information on the back of each envelope: PLEASE DON'T FOLD
2.     This statement MUST BE WRITTEN on each work: “I promise the above work is completely
      original,” and sign your name.
SEND IT ALL SUMMER!   
        By mail
-Teen Ink Box 30        
            Newton, MA 02461    
       On the web-TeenInk.com/Submissions
       By email-Submissions@TeenInk.com
THE FINE PRINT
1. Type print carefully in ink. Keep a copy.
2. Writing may be edited; we reserve the right to publish it without your permission.
3. If due to the personal nature of a piece you don't want your name published, we will respect your request, but you MUST include your name and address for our records.
4. Include a self-addressed envelope, and we'll send a coupon(优惠券)for any Pepsi product and an announcement to let you know we got your work.
5. If published, you will receive a copy of Teen Ink, and a wooden pen.
6. All works submitted will not be returned and all copyrights belong to Teen Ink. We keep the rights to publish all such works in any forms. All material in Teen Ink is copyrighted to protect us and prevent others from republishing your work.

1. All of the following must be submitted EXCEPT          
A. phone number  
B. English teacher’s name  
C. school address  
D. time of birth
2. We can conclude from the passage that Teen Ink is a            
A. magazine  
B. publishing house  
C. research center  
D. advertising company
3. What can be learned from the passage?
A. They must ask your permission before having your work published.
B. The copyrights will be shared by Teen Ink and Pepsi.
C. They only accept your written work.
D. The Pepsi Company sponsors Teen Ink.
4. What is the best title for the passage?
A. JOIN TEEN INK            
B. EMAIL US YOUR WORK
C. SEND US YOUR WORK      
D. KEEP IN TOUCH WITH TEEN INK
题型:单项选择题

起重时,作业人员在起重机械的滚筒上绕有五钢丝绳,该做法()

A.正确,满足起重作业要求

B.不正确,降低起重重量后满足起重作业要求

C.不正确

D.无法判断

题型:单项选择题

门诊对癌症疼痛患者开具的麻醉药品注射剂,每张处方不得超过()

A.一次常用量

B.3日常用量

C.7日常用量

D.15日常用量

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