题目:
建筑材料在自然状态下,单位体积的质量,是以下哪种基本物理性质()
A. 精确密度
B. 表观密度
C.堆积密度
D. 比重
答案:
参考答案:B
解析:
表观密度(又称体积密度、容重)是指材料在自然状态下(包括材料实体积、闭口孔隙和开口孔隙体积),单位体积的质量。
建筑材料在自然状态下,单位体积的质量,是以下哪种基本物理性质()
A. 精确密度
B. 表观密度
C.堆积密度
D. 比重
参考答案:B
解析:
表观密度(又称体积密度、容重)是指材料在自然状态下(包括材料实体积、闭口孔隙和开口孔隙体积),单位体积的质量。
读图回答下列问题。
(1)指出图中A、C两地的地理位置:A、__________ C、__________(2)在图中A、B、C三地中,位于南、北半球分界线上的是______地,位于东半球的是______地,位于西半球的是______地。
(3)A地位于C地的______方向。
设
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It seems school children all over the world complain about their school food. Cherie Blair, the wife of previous Prime Minister Tony Blair, said that she would prepare a packed lunch for her son if school dinners do not improve. So what do students of your age eat for lunch at school?
Japan
High schools have canteens(食堂), which serve everything from noodles to rice, but not burgers and chips. Other children bring food from home such as cold rice balls, meat or fish, pickles(泡菜) and vegetables.
Students take home a menu for the coming month containing notes on nutrition(营养)value. Twice a year parents are invited to have a taste of the food. The class with the fewest leftovers(剩饭) at the end of the month receives a prize.
Untied States
A typical menu from a US school is made up of a hamburger with fried potatoes or roast chicken, lettuce and pickles, fruit and cookies. School lunches must also provide at least one-third of the daily dietary allowances (定量) of protein, vitamin A, vitamin C, iron, calcium, and calories.
Australia
Meat pies, sausage rolls and hotdogs are all traditional dishes in Australian school shops. But as the nation pays more attention to children’s health, healthier foods have started to find their way onto school menus.
Many schools have used a traffic light system. The sale of red-labelled foods, including pastries, chocolate and soft drinks, is served only twice a week. Healthier green-labelled foods such as sushi (寿司), sandwiches, corn and watermelon, however, are available every day.
In some schools, students have a choice of up to 89 foods to choose from, including popcorn and rice.
South Africa
Most of South Africa’s schools do not serve meals at all. Classes end at 1:30pm and students get their own lunches. Many students bring food from home, usually sandwiches.
Fast food and fried food sell the best among students, which has led to a rise in obesity among children. But as more people began to realize the fact that being too fat may cause different diseases, some schools in towns have led the way towards better nutrition. Now students at these schools are provided with lunches of porridge with vegetables, such as cabbages, onions, beans, carrots and tomatoes.
小题1:What does the underlined word “obesity” in the last paragraph probably mean?
A.Nutrition.
B.Addiction.
C.Food shortage.
D.Overweight.小题2:We can infer from the passage that ________.
A.a typical menu from a US school consists of enough nutrition.
B.most students in South Africa eat their lunch at home.
C.many schools in Australia have traffic lights outside their school.
D.you can have whatever you like in school canteens in Japan.小题3:What is the main idea of the passage?
A.Schools should try to satisfy the needs of students.
B.Schools serve different foods from country to country.
C.Food served in the US is the best of all.
D.School children all over the world dislike their school food.小题4:The article is written for ________.
A.parents
B.schoolmasters
C.students of your age
D.nutritionists
在()量表中,个人的分数指出了他的行为在按正常途径发展方面处于什么样的发展水平。
A.年龄
B.态度
C.智力
D.人格
诊断甲状腺功能亢进症最可靠的检查方法是
A.基础代谢率测定
B.放射性碘摄取试验
C.放射免疫分析测定T3
D.放射免疫法测定T4
E.血清蛋白结合碘测定