读海陆分布图,回答问题:
下列各句中,没有语病的一项是( )
在氢气还原氧化铜的实验中,进行如下操作:①加热 ②停止加热 ③通入氢气 ④停止通入氢气.
下列操作顺序正确的是( )
①努力是梦想与现实之间的桥梁 ②梦想的实现更要付诸行动
③只要坚持努力,就会实现梦想 ④梦想是人生的精神支柱
Today is Sunday. It is a sunny day. Mike and Paul are going to have a picnic in the park. There are many green trees. Near the gate,there is a lake. Some ducks are swimming on the lake.
Mike and Paul are going to have lunch at half past eleven. Then they are going to read some books under a big tree.
某小学校足球队22名队员年龄情况如下:
年龄(岁)
12
11
10
9
人数
4
6
2
则这个队队员年龄的众数和中位数分别是( )