某生产小组有15名工人,调查每个工人的日均零件生产能力,获得如表数据:
日均生产零件的个数(个)
5
6
7
8
9
10
工人人数(人)
3
2
4
1
(1)求这15名工人日均生产零件的众数、中位数、平均数.
(2)为提高工作效率和工人的工作积极性,生产管理者准备实行“每天定额生产,超产有奖”的措施,如果你是管理者,你将如何确定这个定额?请说明理由.
(1)根据图文回答下列问题.
①金刚石的____ (填“硬度”或“密度”)大.
②钠元素是人体必需的____ (填“常量”或“微量”)元素.
③面包中淀粉属于____ (填字母序号).
A、糖类 B、蛋白质 C、油脂
④100g该硫酸溶液中溶质质量为____ g.
(2)自行车是绿色出行的交通工具,根据图文回答下列问题.
①锰属于____ (填“金属”或“非金属”元素).
②制造钢质轮圈利用了金属的延展性,这属于____ (填“物理”或“化学”)性质.
③材质属于有机合成材料的是____ (填字母序号).
④在____ (填“潮湿”或“干燥”)的空气中,自行车的铁质部件更易生锈.
On Sundays we often go to the1near our school. There are many2 in it—tigers, elephants, pandas and monkeys. The3 are very big. They all have4 noses. Their noses can5 them eat and drink. Tigers are very6. They often run around. They don't like to7 in the zoo. Many people like8. They are animals of China. But I like monkeys most. We like9 to the zoo. We can10 more about animals there.
⑴How many seasons are there in a year?____ A. Four
⑵What about some milk?____ B. She's in the kitchen.
⑶What would you like?____ C. They're on the sofa.
⑷Where are my warm clothes?____ D. Sounds good.
⑸I can't find Mum.____ E. I'd like a hamburger.
某点以东是西半球,以西是东半球,以北有极昼极夜现象,以南为温带,这点的地理坐标是( )
《雨说》是采用____手法所写的诗歌。它的作者是____(地名)当代诗人____(人名)。