在武汉封城的最危险的关头,有那些逆流而上的志愿者奔赴江城,留下了坚定的足印;在方舱医院里的患者朝不保夕的时候,有黄玉婷、杨一帆这些逆流而上的苦读学生,展现出最美的身影;当疫情为我们整个社会按下了暂停键的期间,有医生、警察、保安、快递员这些逆流而上的人,维持了这个城市的正常运转……人生的道路上总是充满了风浪与挑战,只有逆流而上的你,才能铸就属于自己的辉煌。
请以“逆流而上”为题,写一篇作文。
要求:①将题目抄写在答题卡作文纸的第一行(题目前空四格);
②文体自选(诗歌、戏剧除外);
③不要套作,不得抄袭;
④不少于600字;
⑤文章不得出现真实的人名、校名、班级名。
的顶点在格点上,请仅用无刻度直尺完成以下作图(保留作图痕迹).
( 1 )在图1中,作
关于点
对称的
;
( 2 )在图2中,作
绕点
顺时针旋转一定角度后,顶点仍在格点上的
.
的展开式中常数项为.
在学校,有了事情找哪里?

某同学研究铝及其化合物的性质时设计了如下两个实验方案.
方案一:
方案二:
已知:NaOH溶液和稀盐酸的浓度均是3mol•L﹣1 , 如图是向X溶液和Y溶液中分别加入NaOH溶液和稀盐酸时产生沉淀的物质的量与加入盐酸和氢氧化钠溶液体积之间的关系,下列说法正确的是( )

At the Green Free School in Copenhagen, Denmark, education is all about sustainability(可持续性). There are no desk, no blackboards and no tests. Students spend much of their time studying outdoors.
A group of 12 children are sitting in a circle when the bell rings. Instead of rushing to their next class, the children close their eyes. "Raise your hand when you can no longer hear a sound," says their teacher, holding a pair of bronze cymbals. One by one, their hands go up.
"I've always learned how to be around the world in a respectful(尊重的)way. To me, it's important to create a school that would think about the green transition (过渡) we are going through," says Phie Ambo, who started the school in 2014.
Now there're about 200 students at the school. According to Ambo, some parents come because of the green transition. And some come because it's a small school and they want a closer relation to the whole school society." In Denmark we have some super schools with thousands of children and a lot of people aren't comfortable with this," Ambo explains.
The school not only serves healthy food, but it allows kids to bring whatever they want to eat. "It's to show our kids that making the whole green transition can be fun and nice and it's not about not doing things," Ambo says. "We're all taking the first steps and learning from each other."
方成思考后发现了如图1的部分正确信息:乙先出发1h;甲出发0.5小时与乙相遇.
请你帮助方成同学解决以下问题:

h与乙相遇,问丙出发后多少时间与甲相遇?
读图(地球经纬网图),选择正确的说法( )
