简述牒的适用范围的演变情况。

六腑的主要功能是

A．行血气

B．藏精气

C．传化物

D．主生殖

E．行津液

C

Flags have existed for over 3000 years.The earliest flags were wooden or metal poles topped with a carving.About 2000 years ago pies of fabric were added to some poles for decoration.Over the next 500 years the free-flying part of the flag became more important.

Every country today has its own flag.Many groups and organizations also have a flag which stands for,or symbolizes,the aims of the group.

The flag depicts (描绘)a world map,centered on the north pole.The map is surrounded by an olive(橄榄)wreath(花环)symbolizing peace and co-operation.The flag is blue and white.

8.Flags have been in existence for _________.

A.500 years                     B.over 3000 years

C.about 2000 years              D.between 500 and 2000 years

9.A very old flag is likely to _________.

A.be made of fabric             B.have a map on it

C.have white shapes on it       D.be made of carved wood

10.An olive wreath is used to represent _________.

A.peace         B.purity        C.justice       D.equality

在有些企业中，一方面存在5个人干3个人活的现象，另一方面在一些关键岗位上又缺乏合适人选，这种情况称为（）。

A.人力资源不足 

B.人力资源供需平衡 

C.人力资源过剩 

D.人力资源结构性失衡

注重建筑节能，主要通过改善建筑围护结构的保温性和( )来实现的。

A．可靠性

B．先进性

C．气密性

D．适用性

袋式收尘器常用的滤布有（）。

A.天然纤维、合成纤维、无机纤维

B.海军呢、工业用呢

C.涤纶呢、尼龙布、玻璃纤维