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问题 单项选择题

生产经营单位的( )是本单位安全生产的第一责任者，对安全生产工作全面负责。

A．班组长
B．岗位工人
C．主要负责人
D．主管单位负责人

答案

参考答案：C

解析： 生产经营单位的主要负责人是本单位安全生产的第一责任者，对安全生产工作全面负责。

单项选择题

某多层现浇网筋混凝土结构，设两层地下车库，局部地下一层外墙内移，如图2-5所示。设计使用年限为50年，结构安全等级为二级。已知室内环境类别为一类，室外环境类别为二b类，混凝土强度等级均为C30。

梁L1在支座梁KL1右侧截面及配筋如图2-7所示，假定按荷载组合的准永久组合计算的该截面弯矩值M＝600kN·m，a＝a＝70mm。试问，该支座处梁端顶面按矩形截面计算的考虑长期作用影响的最大裂缝宽度ω（mm），与下列何项数值最为接近（）？

A.0.21

B.0.25

C.0.29

D.0.32
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单项选择题

The "standard of living" of any country means the average person’s share of the goods and services which the country produces. A country’s standard of living, (1) , depends first and (2) on its capacity to produce wealth." Wealth" in this sense is not money, for we do not live on money (3) on things that money can buy. "Goods" such as food and clothing, and "services" such as transport and " (4) ". A country’s capacity to produce wealth depends upon many factors, most of (5) have an effect on one another. Wealth depends (6) a great extent upon a country’s natural resources. Some regions of the world are well supplied with coal and minerals, and have a fertile soil and a (7) climate; other regions possess none of them.

Next to natural resources (8) the ability to turn them to use. China is perhaps as well (9) as the USA in natural resources, but suffered for many years from civil and (10) wars, and (11) this and other reasons was (12) to develop her resources. (13) and stable political conditions, and (14) from foreign invasion, enable a country to develop its natural resources peacefully and steadily, and to produce more wealth than another country equally well (15) by nature but less well ordered.

A country’s standard of living does not only depend upon the wealth that is produced and consumed (16) its own borders, but also upon what is indirectly produced through international trade. (17) , Britain’s wealth in foodstuffs and other agricultural products would be much less if she had to depend only on (18) grown at home. Trade makes it possible for her surplus manufactured goods to be traded abroad for the agricultural products that would (19) be lacking. A country’s wealth is, therefore, much influenced by its manufacturing capacity, (20) that other countries can be found ready to accept its manufactures.

16（）

A.with

B.within

C.near

D.around
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