小学科学四上作业本参考答案.doc

小学科学四上作业本参考答案
of rural drinking water sources, protection of drinking water sources in rural areas by the end oion of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
1. 选择题：（1）C（2）A（3）D（4）A
2. 玻璃棒、铁架台、漏斗、烧杯。
：（1）B（2）B
2。物质在水中是怎样溶解的
活动记录：
1.（略）
2.
面粉
沙
食盐
高锰酸钾
能否看见颗粒
能
能
否
否
分布是否均匀
否
否
是
是
是否有沉淀出现
有
有
否
否
能否用过滤的方法分离
否
否
能
否
是否溶解
否
否
是
是
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
课堂练习：
（1）C（2）B（3）C（4）C（5）A
3。液体之间的溶解现象
活动记录：
1.（略）
2.
胶水
醋
酒精
食用油
进入水中后的状态
沉入水底
分散
分散
浮在水面
在水中怎样扩散
慢慢扩散
很快扩散
很快扩散
不扩散
充分搅拌或振荡后的状态
分散在水中
均匀分散在水中
看不见
浮在水面
是否溶解
是
是
是
否
课堂练习：
选择题（1） C（2）A（3）C（4）C
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, p