半圆的半径为3厘米,半圆的周长为[ ] A.9.42厘米 B.15.42厘米 C

题型:选择题

问题:

半圆的半径为3厘米,半圆的周长为[ ]

A.9.42厘米

B.15.42厘米

C.18.84厘米

D.12.42厘米

考点:圆的周长
题型:选择题

ITEM表包含了如下的列:
ITEM_ID NUMBER(9)
COSTNUMBER(7, 2)
RETAIL NUMBER(7, 2)
其中,RETAIL和COST列的值都大于0。查看以下的两个SQL语句,请问其结果是什么
(1)SELECT iterm_id, (retail*1.25)+5.00-(cost*1.10)-(cost*.10)
FROM item;
(2)SELECT item_id, retail*1.25+5.00-cost*1.10-cost*.10
FROM item;

A.第一个语句返回的结果将比第二个语句返回的低
B.第一和第二个语句将返回相同的结果
C.第一个语句返回的结果将比第二个语句返回的高
D.两个语句中只有一个将被执行

题型:选择题

揭示了医学研究团结同道的协作性原则()

A.仅从个人兴趣或追逐个人利益出发选择研究课题是不道德的

B.居里夫人把氯化镭包在自己的前臂上观察镭对人的皮肤的烧伤状况,表现了崇高的道德

C.由个人完成发明创造的时代,已经同爱迪生一去不复返了

D.1969年至1981年的12年间,年轻的心脏病研究者约翰·达西博士共编造假论文100篇以上

E.尸体解剖有利于医学的发展和总结医疗经验

题型:选择题

金属全冠初戴就位困难的主要原因哪项不对()

A.接触点过紧

B.基牙表面过于粗糙

C.组织面有小结节

D.基牙有倒凹

E.铸造件变形

题型:选择题

男,26岁,左腰腿痛1月,加重5天,直腿抬高实验及加强实验阳性,双下肢肌力正常,X线片示腰椎曲度变直,轻度退变。

根据病史体征及X线检查其诊断应是()

A.腰肌劳损

B.梨状肌综合症

C.腰椎管狭窄

D.腰椎间盘突出症

E.腰椎肿瘤

题型:选择题

Manners are important to happy relations among people. Everyone likes a person with good manners. No one likes a person with bad manners. But what are good manners How does one know what to do and what not to do

It is bad manners for you to say ______ when someone asks you a question.
A. I don’t know B. a lot of things C. nothing

As a student, it is bad manners to come late to class. If you are late you should make an apology to the teacher at the time or after class. It is also bad manners to keep silent when the teacher asks you a question. If you do not know the answer, say "I don’t know" at once. If you do know, answer in a loud enough voice so that all the class may hear. It is polite for the students to help the teacher. Sometimes students can help their teacher to clean the blackboard, to close or open the door or windows. Sometimes there are papers to collect or to hand out. This kind of help is always appreciated.

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