我国提倡一对夫妇只生育一个孩子,从种群特征看,这项措施的目的主要是() A.控制年龄

题型:单项选择题

问题:

我国提倡一对夫妇只生育一个孩子,从种群特征看,这项措施的目的主要是()

A.控制年龄组成,稳定种群密度

B.控制死亡率,降低种群密度

C.控制年龄组成,降低种群密度

D.控制出生率,降低种群密度

考点:高中生物种群和群落种群和群落题库
题型:单项选择题

Tom and Mike are good friends. They are good with children. They want to find jobs in summer vacation. This Friday Tom tells Mike that Sunson School Trip needs teachers to help with sports, music and computer. Mike is glad to know that.

Tom can play basketball, volleyball, and he can swim. Mike can play the violin, the trumpet, the drums and the guitar, and he can swim,too. Tom and Mike like computers very much. Can they join Sunson School Trip?

小题1:Tom and Mike are good               .

A.teachers

B.friends

C.children

D.musicians小题2:What do they want to do in summer vacation?

A.They want to play computer games.

B.They want to go to a movie.

C.They want to find jobs.

D.They want to go to school.小题3:What kind of job can they do?

A.They can do the job of playing soccer.

B.They can do the job of doing Chinese kung fu.

C.They can be in the Rock Band.

D.They can help kids with swimming.小题4:Tom and Mike like               very much.

A.playing volleyball

B.playing the violin

C.computers

D.dancing小题5:Mike can             .

A.play the guitar

B.play basketball

C.play the piano

D.play volleyball

题型:单项选择题

监理规划指导项目监理机构全面开展监理工作,具体包括( )等。

A.确定监理工作目标

B.制定监理工作程序

C.确定目标控制措施

D.确定组织协调的方法和手段

E.确定监理大纲的编写依据

题型:单项选择题

预激综合征伴发心房颤动时,应选用()

A.毛花苷C

B.普萘洛尔

C.普罗帕酮

D.维拉帕米

E.华法林

题型:单项选择题

简述外商参与打捞中国沿海水域沉船沉物,可以采取的方式。

题型:单项选择题

以下不属于以太网帧结构组成的是( )。

A.前导码与帧的前定界符

B.目的地址与源地址

C.帧校验字段

D.帧尾

更多题库