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[单选题]

REVOLOVED，SURFACE和REVOLOVE命令的共同之处在于()。

A.都能生成三维实心体模型

B.都能生成三维多边形网格

C.都需要以直线LINE作为旋转轴

D.都能以任何开放或封闭对象作为路径曲线

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发布时间：2020-09-17

更多“REVOLOVED，SURFACE和REVOLOVE命令的共同之处在于（)。A.都能生成三维实心体模型B.都能生成三维多”相关的问题

第1题

The ocean is heating up. That&39;s the conclusion of a new study that finds that Earth&3

9;s oceans now (27)heat at twice the rate they did 18 years ago. Around half of ocean heat intake since 1865 has taken place since 1997, researchers report online in Nature Climate Change.

Warming waters are known to (28)to coral bleaching(珊瑚白化) and they take up more space than cooler waters, raising sea (29). While the top of the ocean is studied, its depths are more difficult to (30)The researchers gathered 150 years of ocean temperature data in order to get better (31)of heat absorption from surface to seabed. They gathered together temperature readings collected by everything from a 19th century (32)of British naval ships to modern automated ocean probes. The extensive data sources, (33)with computer simulations(计算机模拟), created a timeline of ocean temperature changes, including cooling from volcanic outbreaks and warming from fossil fuel (34).

About 35 percent of the heat taken in by the oceans during the industrial era now residents at a (35)of more than 700 meters, the researchers found. They say they&39;re unsure(36)whether the deep-sea warming canceled out warming at the sea&39;s surface.

A absorb

B combined

C contribute

D depth

E emission

F.explore

G explore

H.floor

I.heights

J.indifferent

K level

L.mixed

M picture

N unsure

O voyage

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第2题

It seems to shine unchangingly, pouring out a constant light year after year. But the sun

may not be nearly so stable as we suppose. It is now thought to move quickly and irregularly and change in long-term cycles, growing dimmer and then brighter with each passing year. Some even fear that its frequent changing behavior. would have a great influence on the Earth' s climate.

The source of the sun' s inconstancy is magnetism. Professor William Livingston has developed new theories about its magnetic nature.

"We don' t yet know what causes sun spots, "he says, "but we now think they ' re areas of high level magnetism that come up from the sun' s interior. So strong is their magnetic pull that the highly ionized gas nearby is not able to transmit energy out. "As a result these areas send out less heat and light and thus appear from Earth to be almost dark irregular surface patches.

Sun spot activity generally fluctuates in steady, 11-year cycled. Scientists have long formed the o pinion that as the size and number of sun spots increased, the overall energy sent out by the sun would de crease. Indeed, recent studies confirmed it, revealing that during peak periods of sun spot activity, the Earth experiences a small drop that can be seen clearly in received solar energy.

Could such a small drop in energy have an effect here on earth？ Perhaps some scientists think the world temperature could fall by' as much as 0.2 during periods of high solar magnetism.., enough to cause significant fluctuations in weather patterns.

According to the passage, it is believed that the sun ______ ．

A．moves in a quick but steady way year after year

B．sends out less and less heat and light with each passing year

C．radiates the same amount of light every year

D．might have a strong influence on the weather patterns

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第3题

The word “surface” in the passage means the ______．A.marketB.airC.top of a liquidD.sea

The word “surface” in the passage means the ______．

A.market

B.air

C.top of a liquid