以下哪个方法能够使一个凹陷的乒乓球恢复原状?
Std5 Science Quiz 3/12

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Fun
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5th Grade
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Medium
Y T
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
摩擦双手后捂住乒乓球
将乒乓球浸在冷水里
将乒乓球浸在热水里
用本生灯加热乒乓球凹陷的部分
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
图里的植物对什么外来刺激产生反应?
阳光
水
触动
地心引力
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
长期粪便和排泄物没排出会给人类带来什么影响?
使身体健康
能增加胃口
长期留在体内的废物会形成毒素,危害健康
会影响呼吸系统
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
图里的动物是依靠什么呼吸器官来维持生命?
气孔
鳃
潮湿的皮肤
书肺
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
我们在吸气时,进入肺里的空气含有较多的什么成分?
水分
氧气
一氧化碳
二氧化碳
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下哪项是导致铁制品生锈的因素?
空气和油
水和空气
空气和无水氯化钙
沸水和空气
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
为什么乌龟要缩进壳里?
保护幼儿
繁殖下一代
适应恶劣气候
保护自己免受天敌伤害
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