脉动高梯磁选机的脉动机构主要作用是使矿粒群保持()状态。

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问题:

脉动高梯磁选机的脉动机构主要作用是使矿粒群保持()状态。

考点:磁选工磁选工(高级)磁选工(高级)题库
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下列有关病毒的叙述中不正确的是(  )

A.十分微小,不具备细胞结构

B.虽无细胞结构,但它是属于生物

C.生活离不开活的细胞,营寄生生活

D.病毒对人类只有害处

题型:填空题

()用于厂区有变配电所、低电压进线的车间以及民用楼房及写字楼。

A、TT系统

B、TN-C系统

C、TN-S系统

D、TN-C-S系统

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读下图,按要求回答问题:

(1)将图中字母所代表的地理事物名称填写在下列横线上:

    A、     海   B、    洋   D、     海峡   E、     山脉

(2)此岛为我国第     大岛,与祖国大陆隔海相望的是         省。

题型:填空题

With the average temperature for January standing at -50 ℃,it is no wonder the Russian village of Oymyakon is the coldest permanently inhabited settlement in the world.Known as the“Pole of Cold”,the coldest ever temperature recorded in Oymyakon is -71.2 ℃.This is the lowest recorded temperature for any permanently inhabited location on Earth and the lowest temperature recorded in the northern hemisphere(北半球).

Ironically,Oymyakon actually means“nonfreezing water”due to a nearby hot spring.Most homes in Oymyakon still burn coal and wood for heat and enjoy few modern conveniences.

Nothing grows there so people eat reindeer(驯鹿)meat and horsemeat.A single shop provides the town's bare necessities and the locals work as reindeerbreeders,hunters and icefishermen.

There are few modern conveniences in the village—with many buildings still having outdoor toilets—and most people still burn coal and wood for heat.When coal deliveries are irregular,the power station starts burning wood.If the power ceases,the town shuts down in about five hours,and the pipes freeze and crack.

Daily problems that come with living in Oymyakon include pen ink freezing,glasses freezing to people's faces and batteries losing power.Locals are said to leave their cars running all day for fear of not being able to restart them.Even if there was coverage for mobile phone reception,the phones themselves would not work in such conditions.

Another problem caused by the frozen temperatures is burying dead bodies,which can take anything up to three days.The earth must first have thawed(融解)sufficiently in order to dig it,so a bonfire is lit for a couple of hours.Hot coals are then pushed to the side and a hole couple of inches deep is dug.The process is repeated for several days until the hole is deep enough to bury the coffin.

Travel companies offer tourists the opportunity to visit the village and sample life in the freezing conditions.

小题1:From the passage we can infer that people in Oymyakon ________.

A.prefer meat to any other kind of food

B.seldom have fresh vegetables and fruits

C.can buy anything in the shop

D.might row a boat to catch fish小题2:Which of the following is the first step when burying a dead body?

A.The coffin must be put in place.

B.A bonfire has to be lit first.

C.Hot coals have to be pushed to the side.

D.A hole couple of inches deep is dug.小题3:Mobile phones would not work in Oymyakon because ________.

A.the batteries are of poor quality

B.there was no coverage for phone reception

C.batteries can't be charged in such conditions

D.the extreme coldness makes the batteries lose power小题4:Why do the locals have their cars running all day?

A.They are afraid they can't get the car started.

B.They want to keep warm in the car.

C.They have abundant oil resources.

D.They have little awareness of saving.

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