连续抽油杆主要优点有哪些?

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问题:

连续抽油杆主要优点有哪些?

考点:采油工考试采油初级工考试采油初级工考试题库
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《水力发电厂计算机监控系统设计规范》规定:为确保监控系统交换机的安全性,交换机应支持()功能。

A.端口分级安全设定、端口与MAC地址的绑定、对空闲端口的关闭等;

B.端口与MAC地址的绑定、端口的VLAN划分、对空闲端口的关闭等;

C.端口的分级安全设定、端口与MAC地址的绑定、端口的VLAN划分等。

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按民事权利是否已具备实现的现实可能性,可将其区分为( )

A.原权和救济权

B.既得权和期待权

C.主权利和从权利

D.请求权和抗辩权

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不应诊断为高热惊厥的疾病有哪些?

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When workers become more efficient, it’s normally a good thing. But lately, it has acted as a powerful brake on job creation. And the question of whether the recent surge in productivity has run its course is the key to whether job growth is finally poised to take off.

One of the great surprises of the economic downturn that began 27 months ago is this.. Businesses are producing only 3 percent fewer goods and services than they were at the end of 2007, yet Americans are working nearly 10 percent fewer hours because of a mix of layoffs and cutbacks in the workweek.

(46) That means high-level gains in productivity--which in the long run is the key to a higher standard of living but in the short run contributes to sky-high unemployment. So long as employers can squeeze dramatically higher output from every worker, they won’t need to hire again despite the growing economy.

(47) On Friday, the Labor Department will release a closely watched March employment report expected to show the pest job growth in three years, driven by stabilization in the economy and a rebound from February snowstorms.

A p March job-growth number-at a time when the economy is growing at only a middling pace--would suggest that the productivity boom has largely run its course. (48) Regardless, the question of what caused the burst in workers’ efficiency is one of the great unanswered questions of the expansion and has huge stakes for the economy over the coming year.

"It is an episode that we’re going to--we, economists in general--are going to want to understand better and look at for a long time," Federal Reserve Chairman Ben S. Bernanke said at a hearing last week in which he described the productivity gains as "extraordinary" and acknowledged he had not foreseen them.

(49) Businesses have certainly not been investing in new equipment that might enable workers to be more efficient-capital expenditures plummeted during the recession and are rebounding slowly. (50) And the structural shifts occurring in the economy are so profound that one would expect productivity to be lower, rather than higher, as people need new training to work in parts of the economy that are growing, such as exports and the clean-energy sector.

So what’s happening As best as anyone can guess, the crisis that began in 2007 and deepened in 2008 caused both businesses and workers to panic.

(46) That means high-level gains in productivity--which in the long run is the key to a higher standard of living but in the short run contributes to sky-high unemployment.

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使用信用证、付款交单、承兑交单三种方式结算贷款,就卖方的收汇风险而言,从小到大依次排序为()。

A.D/P、D/A和L/C

B.D/A、D/P和L/C

C.L/C、D/P和D/A

D.L/C、D/A和D/P

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