建筑工程规划管理的内容有( )。A．建筑物使用性质的控制 B．建筑物所在地段土地价

商场里有两批商品，都卖1200元．其中一批赚了20%，另一批却亏了20%．经理最后计算这两批商品的利润时，发现是（　　）

A．不赚也不亏

B．赚了100元

C．亏了100元

D．无法判断

施工项目经理部内部关系的协调，主要使用（）协调。

A．施工合同

B．生产计划

C．行政方法

D．相关法规制度

由于森林过量砍伐和草场大面积开垦，土地出现沙漠化，进而出现沙尘暴天气，沙尘暴使空气中增加了大量的

A．一氧化碳

B．粉尘

C．二氧化硫

D．二氧化氮

多糖是由十个以上的单糖通过

A．肽键连接而成的聚糖
B．酯键连接而成的聚糖
C．苷键连接而成的聚糖
D．氧键连接而成的聚糖
E．氢键连接而成的聚糖

You probably won’t be shocked to find out that the inventor of tire rubber is Charles Goodyear, as he’s the only guy on the list to actually get his name attached to the end product. (46) It wasn’t easy coming up with a form of rubber tough enough to withstand the drag racing and car chases everyone envisioned the day the automobile was invented. In fact, if there was one man who should have given up his life dream, it was Goodyear. (47)The man spent time in and out of prison, lost every friend he had and starved his children in his tireless pursuit of a per form of rubber.

(48) After his first two years of tinkering and failing with primitive rubber in the 1830s, Goodyear and his family were camping out in an abandoned factory and fishing for sustenance. This is when he made a huge breakthrough: He’d use acid to smooth out and toughen rubber! The government bought 150 mailbags made of the stuff and the rest is...

Oh, wait. They were all defective. The process didn’t work and Goodyear was ruined. Again.

Finally in 1839, Goodyear wandered into a general store with another failure of a formula. The crowd watched and laughed at him. (49)In a rage, he began to shake his fist, flinging a piece of his rubber onto the hot stove top.

After inspecting the charred remains, he realized that he had just found a way to make durable, weatherproof rubber. (50) Despite what we’re sure were numerous failed "now let’s try setting this on fire to see if it improves it!" experiments, an empire was born.

(50) Despite what we’re sure were numerous failed "now let’s try setting this on fire to see if it improves it!" experiments, an empire was born.