网址：http://m.1010jiajiao.com/timu_id_2260368[举报]
| 瓶子编号 | 种子的数量 （个） | 种子所处的环境 （其他外界条件均适宜） |
| A | 3 | 少量水，20℃ |
| B | 3 | 无水，20℃ |
| C | 3 | 少量水，—10℃ |
| D | 3 | 水将种子淹没，20℃ |
（2）探究温度对种子萌发的影响，应该用__________两号瓶做对照实验。
（3）请你预期A号、D号瓶的实验结果依次是_______________________（萌发和不萌发），据此可以得出的结论是_____________________________________。
（4）指出本实验设计中的不足是_____________________________________。
（5）如果在严格按照上表的实验条件进行实验的情况下，用于实验的种子最终都没有萌发，原因可能来自_____________________。
（6）若探究光照对该种子的萌发有无影响，请完成下列实验方案设计。
第一步：在两同样瓶加入适量的水，_____________________________；
第二步：________________________ ，另一组瓶置于黑暗的环境中。 查看习题详情和答案>>
（1）下列叙述中符合物理学史实的有（ ）
| A．托马斯·杨通过对光的干涉现象的研究，证实了光具有波动性 |
| B．卢瑟福通过“α粒子散射实验”的研究，发现了原子核是由质子和中子组成的 |
| C．麦克斯韦验证了电磁场理论，提出了光是一种电磁波 |
| D．贝克勒尔发现了天然放射现象，并提出了原子的核式结构学说 |
①当小车、车厢、物体以共同速度运动时，物体相对车厢的位移（设物体不会从车厢上滑下）；
②从绳拉紧到小车、车厢、物体具有共同速度所需时间．（取g=10m/s2） 查看习题详情和答案>>
下面是一份针对某市初中生的生活方式的调查问卷表（questionnaire）。该表包括问题、分值（scores）和结论。请先根据自己的实际情况完成问卷调查表，计算出自己的得分，再据此写一篇短文内容包括，简单描述你的生活方式，说出你的得分，并通过你的最后得分确定你的生活方式是否健康，并说出你今后的打算。
|
Middle school students’ lifestyle questionnaire Your choice:
A. less than three times a week B. three to six times a week C. every day 2. How long do you sleep every
night?
A. less than 7 hours B. more than 9 hours. C. 7-9 hours 3. How much TV do you watch without a stop
every
day?
A. more than 2 hours B. 1 hour to 2 hours C. less than half an hour 4. How often do you eat cakes, cookies,
sweets, ice-cream and junk food? A. often B. sometimes C. never 5. How often do you eat fruit and
vegetables?
A. never B. sometimes C. often 6. How often do you walk to
school?
A. never B. sometimes C. often
|
||
|
Scores: A=1 point
B=2points C=3 points Your health
score: |
||
|
Conclusion: 6~9 points: Not healthy at all. Need exercise. Watch less TV. Sleep enough hours. Need healthy food. 10~13 points: Not bad but not healthy enough. Need more exercise, sleep and healthier food. 14~18 points: Very healthy. Congratulations! |
注意：1.描述生活方式请勿照抄原句，尽量用自己的话来写。
2. 字数不少于60。
查看习题详情和答案>>
| Middle school students’ lifestyle questionnaire Your choice:  1. How often do you exercise? A. less than three times a week B. three to six times a week C. every day 2. How long do you sleep every night?  A. less than 7 hours B. more than 9 hours. C. 7-9 hours 3. How much TV do you watch without a stop every day?  A. more than 2 hours B. 1 hour to 2 hours C. less than half an hour 4. How often do you eat cakes, cookies, sweets, ice-cream and junk food?  A. often B. sometimes C. never 5. How often do you eat fruit and vegetables? A. never B. sometimes C. often 6. How often do you walk to school? A. never B. sometimes C. often |
| Scores: A="1" point B="2points " C="3" points Your health score: |
| Conclusion: 6~9 points: Not healthy at all. Need exercise. Watch less TV. Sleep enough hours. Need healthy food. 10~13 points: Not bad but not healthy enough. Need more exercise, sleep and healthier food. 14~18 points: Very healthy. Congratulations! |
2. 字数不少于60。 查看习题详情和答案>>