题目内容
建筑物发生火灾后，有效的( )是保护人们生命财产安全的重要手段。
查看答案
搜索结果不匹配？点我反馈
更多问题
先张法施工中有以下工序：①放松预应力钢筋；②张拉预应力钢筋；③浇筑混凝土；④养护；⑤拆模；⑥支侧模、安设预埋件。其工艺流程顺序为( )。
高温强热辐射作业的工作地点气温一般在( )℃以上
金属材料的焊接，( )是利用焊件表面互相摩擦产生的热使端面达到热塑性状态，然后迅速顶锻而完成焊接的一种压焊方法。
Improvements in labor productivity 56 increase wages and salaries. Wages and salaries 57 about 75 percent of all income in the United States. 58 , labor productivity is the major 59 of this (and all other) nations’ living standards. If labor productivity improves because of an advance in technology, the 60 of output increases 61 the need for additional labor. The dollar value of all goods increases 62 , which implies that consumers ultimately receive more income.Entrepreneurs have a profit 63 to increase labor productivity. They do so by providing their workers with better equipment and creating more efficient ways for their workers to use that equipment. Entrepreneurs also have an incentive to discover new products that are more highly valued 64 to their cost of production.Some of the largest increases in productivity occur 65 major technological advancements. The steam engine and the internal combustion engine are two examples. The advances in the computer industry have been 66 phenomenal. Advances in technology depend 67 on businesses making 68 investment in new technology and new products. A major issue in today’s economy is 69 businesses are doing this and what incentives are being provided by the government to companies to encourage investment. Another issue is whether labor productivity in the United States has 70 other countries.There have also been 71 increases in productivity in our agricultural 72 . Because of the increased use of chemicals, the 73 per acre are many times greater than they were 100 years ago, and consequently, 74 Americans now 75 farming, yet agricultural output is the highest it has, ever been. 57（）
微信支付 
支付宝支付