已知O是△ABC的外心,AB=2a,AC=2a,∠BAC=120°,若AO=xA

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问题:

已知O是△ABC的外心,AB=2a,AC=
2
a
,∠BAC=120°,若
AO
=x
AB
+y
AC
,则x+y的最小值是______.
考点:平面向量的应用
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施行中期妊娠引产术的,休假多少天?

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电子商务系统的总体规划需要解决以下三个方面的内容:()、了解企业电子商务系统以及管理状况及对相关信息技术的预测。

A.系统总目标和地域因素

B.企业发展战略和行业因素

C.系统总目标和发展战略

D.系统总目标和组织结构

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评标委员会评审中标人的投标应当符合( )。

A.基本满足招标文件中确定的各项综合评价标准

B.能够满足招标文件的实质性要求,并且经评审的投标价格最低

C.满足招标文件中规定的各项主要综合评价标准

D.能够最大限度满足招标文件中规定的各项综合评价标准

题型:填空题

心血管炎症病变的生物标志物是()

A.CRP

B.CK

C.ALT

D.AST

E.Mb

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If you go to Juliano’s restaurant in San Francisco,you can’t get a cup of coffee or a hot cheese sandwich.All the food in the restaurant is raw,including the pizza and the rice.

Juliano thinks that cooked food makes us sick. “Food is alive,like you and me.When you cook food,you take away some of the vitamins,”he says,Juliano never eats food that is over 50 degrees.His restaurant doesn’t have a stove(火炉) or a microwave(微波炉).But he has lots of clever ideas for making raw food taste great.Instead of heat,Juliano uses water to prepare foood.He puts foods in water to make them soft.For example,he places beans in water for a few days and rice in water for two or four weeks.

Everything at the restaurant is cold,and the pizza and the rice taste good.So do the fruit and vegetable juices made from carrots ,apples,oranges and so on.Juliano’s restaurant doesn’t serve meat,but some people who cat raw food also eat raw meat.Juliano has three friends who ate raw meat.They all got very sick..One of them is still sick.

Juliano eats mostly fruits,vegetables,nuts,rice and beans.He says he feels very healthy. “Raw food gives you lots of energy,”he says,Juliano says he needs only six hours of sleep a night,and he never gets sick..

61.What is the main idea of the passage?

A.A man who eats only raw food.               B.A special restaurant in San Francisco.

C.Raw food is better than cooked food.          D.How to make raw food taste good.

62.How is the food in Juliano’s restaurant prepared?

A.Foods are put into water to make them soft.

B.Foods are cooled in a fridge.

C.Foods are heated on a stove to a certain degree.

D.Foods are boiled and then cooled.

63.What is NOT served in Juliano’s restaurant?

A.Carrot juice.         B.Cold pizza.          C.Raw rice.          D.Hot meat.

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