问题 实验题

一实验小组为进行某项探究实验活动,课前给实验室老师送去了一份器材清单,老师根据清单为他们准备的器材如图所示.

用图中的器材可探究的主题有:

A.液体内部压强大小与液体深度的关系;(填写器材序号)           _.

B.液体内部压强大小与液体密度的关系;(填写器材序号)                 

C.浮力大小与液体深度的关系;(填写器材序号)                   

答案

1,2,3,7,4(或5,或6)

题目分析:用图中的器材可探究的主题有:A,液体内部压强大小和液体深度的关系;

需要的器材是:(5)一杯水、(9)液体压强计和(1)一把塑料刻度尺就行;

故答案为:1,5(或4或6),9.

选探究主题B,探究实验器材选(1)一把塑料刻度尺、(4)酒精和(5)水(或4和6或5和6),(9)液体压强计;

故答案为:1,4和5(或4和6或5和6),9.

选探究主题C,探究实验器材选(1)一把塑料刻度尺、(2)细线、(3)金属块、(4)酒精、(7)弹簧秤

点评:此题考查我们根据器材设计实验的能力,综合性强,灵活性高,要求学生知识面广.这也是中考时经常考到的

默写题
问答题

Exercise, everyone advises! But immediately, when you try, you run into trouble. (46)There is so much contradictory, sometimes incorrect advice about exercising that you become confused. Test yourself on the following true false quiz. It will tell you what you need to know.
1. The best way to reduce the mid-section is to do abdominal exercise.
False. Many people believe that when specific muscles are exercised, the fatty tissues in the immediate area are "burned up." (47)The truth-is that exercise burns fat from all over the body and not from one specific area, regardless of the type of exercise. Of course, if you reduce the fat throughout your body, you will certainly see results around your waistline too!
2. To maintain an adequate level of physical fitness, you need to exercise only twice a week.
False. Studies conducted by NASA, the National Aeronautics and Space Administration, show that unexercised muscles lose their strength very quickly. After 48 to 72 hours, you must use the muscles again to reestablish the good physical effect. And what does that mean to you (48) NASA scientists concluded that while daily exercise is most beneficial, three alternating days each week will maintain an adequate level of physical fitness.
3. To lose weight you should always "work up a good sweat" when exercising.
False. Sweating only lowers body temperature to prevent overheating; it does not help you reduce weight. You may weigh less immediately after a workout, but this is due to water loss. Once you replace the liquid, you replace the weight.
4. If your breathing doesn’t return to normal within minutes after you finish exercising, you’ve exercised too much.
True. Five minutes or so after exercising, your breathing should be normal, your heart shouldn’t be pounding, and you shouldn’t be exhausted. (49) Beneficial exercise is not overly difficult, unpleasant, and exhausting; it is moderate, enjoyable, and refreshing.
5. Walking is one of the best exercises.
True. Walking helps circulation of blood throughout the body, and thus has a direct effect or your overall feeling of health.
6. The minimum amount of time you should spend exercising in a day is 20 minutes.
True. There are more than 400 muscles that attach to your skeleton. (50) A good exercise routine should contract and stretch all these muscles, and this simply cannot be done with four or five exercises in five to ten minutes. From experience, I’ve found that about 20 minutes is the minimum amount of time needed for an adequate workout.