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硅藻土（diatomaceous earth）
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更多 “硅藻土（diatomaceous earth）” 相关考题
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The article suggests that______.A. our earth exists before the sunB. how space formedC. no one knows where the earth comes fromD. our earth used to be part of a high mountain on the sun
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It can be learned from the passage that about four billion years ago ______.A. the earth was in molten stateB. the earth surface temperature was above 100℃C. the earth surface temperature was below 100℃D. rain water could remain on the earth
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All the other five planets ________.[A] always appear near the path of the sun[B] are moving in a way more complicated than the earth does[C] aren't moving around the sun as independently as the earth does[D] are moving around the sun at the same speed as the earth does
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One day on the moon is _____.A. two Earth week longB. two Earth weeks longC. two Earth weeks longerD. two Earth weeks length
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____ is covered with heavy snow.
A.The earth's surfaceB.The surface of earthC.The surface earthD.The earth surface
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下列关于硅藻土过滤器的选用规定错误的是（）A、宜采用牌号为700号硅藻土助滤剂B、单位过滤面积的硅藻土用量宜为0.5-1.0kg/m2C、硅藻土预涂膜厚度不应小于5mm，且厚度应均匀一致D、根据所用硅藻土特性和出水水质要求，过滤速度应经试验确定
考题
单选题下列关于硅藻土过滤器的选用规定错误的是（）A
宜采用牌号为700号硅藻土助滤剂B
单位过滤面积的硅藻土用量宜为0.5-1.0kg/m2C
硅藻土预涂膜厚度不应小于5mm，且厚度应均匀一致D
根据所用硅藻土特性和出水水质要求，过滤速度应经试验确定
考题
单选题While some military planners claimed that it would be possible to win a war fought with nuclear weapons, many scientists argued that such a war could not truly be won, because the fallout from nuclear warfare would create a nuclear winter and it also would be rendering the earth uninhabitable.A
it also would be rendering the earth uninhabitableB
rendering the earth uninhabitableC
might have uninhabitably rendered the earthD
render the earth uninhabitableE
would also have rendered the earth uninhabitable
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单选题As observed from the Earth，the angle between lines from the Earth to the Sun and the Earth to an inferior planet is known as（）.A
elongationB
conjunctionC
oppositionD
quadrature
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单选题During the transition of the Earth’s magnetic field _____.A
the compass will become uselessB
man and animals will be confused as to directionsC
the magnetic strength of the Earth will disappearD
the magnetic strength of the Earth will be stronger
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单选题According to the passage, _____.A
we should not worry about the transition of the Earth’s magnetic fieldB
the Earth’s magnetic field will not change for at least 2000 yearsC
the Earth’s magnetic field has decreased its strength rapidlyD
the transition of the Earth’s magnetic field can be controlled by modern science
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单选题Aphelion is the point where the Sun（）.A
and Moon and Earth form a right angleB
and Moon and Earth are in lineC
crosses the celestial equatorD
is farthest from the Earth
考题
名词解释题硅藻土（diatomaceous earth）
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