下列情形中，经警告无效的，人民警察可以使用驱逐性、制服性警械？（）A、寻衅滋事 B、非

在等差数列｛a_n｝中，a₁₀₀=x，a₂₀₀₌y，则a₁₅₀=_________，a₃₀₀=_________.

在电和磁漫长的发展历史中，许多科学家做出了卓越贡献，其中发现电磁感应现象的科学家是[ ]

A．法拉第 　

B．沈括 　

C．安培 　

D．焦耳

Today the car is the most popular sort of transportation in all of the United States.It has completely 1 the horse as a 2 of everyday transportation.Americans use their car for 3 90% of all 4 business.Most Americans are able to 5 cars.The average price of a 6 made car was ,050 in 1950, ,470 in 1960 and up to ,750 7 1975.During this period American car manufacturers set about 8 their products and work efficiency.As aresult, the yearly income of the 9 family increased from 1950 to 1975 10 than the price of cars.For this reason 11 a new car takes a smaller 12 of a familys total earnings today.In 1951 13 it took 8.1 months of an average familys 14 to buy a new car.In 1962 a new car 15 8.3 of a familys annual earnings, by 1975 it only took 4.75 16 income.In addition, the 1975 cars were technically 17 to models from previous years.The 18 of automobile extends throughout the economy 19 the car is so important to American.Americans spend more money 20 keeping their cars running than on any other item.

1.A.denied B.reproduced C.replaced D.ridiculed

2.A.means B.mean C.types D.kinds

3.A.hardly B.nearly C.certainly D.somehow

4.A.personal B.personnel C.manual D.artificial

5.A.buy B.sell C.race D.see

6.A.quickly B.regularly C.rapidly D.recently

7.A.on B.in C.before D.after

8.A.raising B.making C.reducing D.improving

9.A.unusual B.smallest C.average D.biggest

10.A.slower B.equal C.faster D.less

11.A.bringing B.obtain C.bought D.purchasing

12.A.part B.half C.number D.quality

13.A.clearly B.proportionally C.percentage D.suddenly

14.A.income B.work C.plans D.debts

15.A.used B.spent C.cost D.needed

16.A.months B.years C.family D.year

17.A.famous B.superior C.fastest D.better

18.A.running B.notice C.influence D.affect

19.A.then B.as C.so D.which

20.A.to B.in C.of D.for

良好的焊接性是指钢材的连接部分焊接后，力学性能不低于焊件本身，以防止产生硬化脆裂和内应力过大等现象。（）

A公司为B公司承建厂房一幢，工期自2001年9月1日至2003年6月30日，总造价3000万元，B公司2001年付款至总造价的15%，2002年付款至总造价的70%，余款2003年工程完工后结算。该工程2001年累计发生成本500万元，年末预计尚需发生成本2000万元；2002年累计发生成本2000万元，年末预计尚需发生成本200万元。则A公司2002年因该项工程应确认的营业收入为（）万元

A．2777.78

B．2222.22

C．2177.78

D．1650