①小姑娘有一颗钻____(zuān zuàn)石般的心灵。
②只有刻苦钻____(zuān zuàn)研,才能攻克难关。
③他小心翼翼地把那60芬尼塞____(sāi sài)进了妈妈的上衣口袋。
④他喜欢塞____(sāi sài)外风光吗?
I have a good friend.1 name is Peter.We study in Beijing Sunshine Secondary Schoo1.We are in the same(同一个)class.He sits in front of 2 .His favourite lesson is Music.He 3many CDs.He likes 4 music very much.He likes playing football , t00.After school we often play football in the 5 .He is very helpful.We often help each 6 . Peter is not a Chinese.He is from 7 .He comes to Beijing 8 his family.His father is a doctor and his mother is a nurse. They work from Monday 9 Friday.At weekends,his mother likes shopping and his father likes fishing.Sometimes they go to the park.They all like Chinese food.They 10 very happy.
课堂上老师按图I装置进行分子运动探究实验时,同学们闻到了一股难闻的刺激性气味,课后在老师的指导下,化学兴趣小组对原实验装置进行了改进,改进装置如图II所示(夹持装置已省略)。
14+34= ____
15×56= ____
710−710= ____
23×34= ____
①点燃红磷并伸入到空气瓶中,可观察到____,反应的符号表达式为 ____。
②实验中若红磷量不足会导致实验结果____。
③不能用木炭或硫粉代替红磷实验的原因是____。