集团公司使用的MG400/920采煤机截割电机电压是()V。A、3300VB、660

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问题:

集团公司使用的MG400/920采煤机截割电机电压是()V。

A、3300V

B、660V

C、1140V

D、380V

考点:采煤机司机考试采煤机司机考试题库
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关于x的方程(a-3)x2+x+2a-1=0是一元二次方程的条件是(  )
A.a≠0B.a≠3C.a≠
3
D.a≠-3
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患者男性,33岁,残冠,根尖病变。拔除过程中,远中颊根折断,取根时,牙根突然消失。捏鼻鼓气时拔牙窝内有气体溢出

如X线片显示患者为低位上颌窦,移位的牙根已进入上颌窦,但仍位于拔牙窝附近,此时最佳处理方法()。

A.刮匙搔刮取根

B.观察

C.从穿孔处冲洗吸出断根

D.上颌窦根治术

E.于穿孔处开窗取根

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()给硬盘分区不需要遵循一定的顺序。

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Photoshop中当使用绘图工具时,按住Option(Mac)/Alt(Win)键,可暂时切换到吸管工具。

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Recycling Paper


The process of recycling paper can help to reduce deforestation and energy consumption on a significant scale. There are many different reasons why we should recycle paper products, and some of these are (26) in the paragraphs below.
Energy consumption will always be on the (27) as population levels grow, and so any manufacturing processes which help to reduce energy consumption are (28)
The Energy Information Administration (EIA) claim that there can be as (29) as a 40% energy saving when recycling paper over producing paper (30) the direct raw material.
Although recycling paper has many (31) , it also has its drawbacks. One of these drawbacks is that we cannot recycle the (32) paper product for eternity, as the fibers contained within the paper degrade over time, (33) their strength and length.
On (34) , an individual paper fiber can only be recycled a (35) of six times. Although this is a significant drawback, the six time recycling process will help to (36) a great deal of energy when you consider (37) much paper there is to be recycled.
If paper fibers can be recycled up to 6 times, and we recycled all paper products, this could help to (38) the intensity of deforestation for paper products up to a factor of 6.
With paper production said to (39) around 40% of harvested wood, and paper said to (40) around 90% wood, you can see how recycling paper is an important process for the (41) of our forests.
Today, the use of recycled paper products is on the increase, as more and more people begin to recycle paper (42) products around the home.
Although there are slight differences in the recycling processes of different (43) of paper products (e.g. corrugated, mixed paper, newspaper products), we are able to recycle just about any type of paper product around today.
The recycling logo helps to (44) a recyclable product and can also sometimes help to identify if the product contains any recycled material, in the form of a percentage. This helps a consumer to identify the (45) of recycling various products.

A. welcomed B. challenged C. created D. introduced

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