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【单选题】
能使蛋白质沉淀的试剂是A.
浓盐酸
B.
硫酸铵溶液
C.
浓氢氧化钠溶液
D.
生理盐水
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【单选题】That you cannot feel the movement of earth does not mean that the earth is really______.
A.
steady
B.
sturdy
C.
stubborn
D.
stationary
【单选题】By citing the toothpaste is out of the tube, the author intends to mean that______.
A.
a younger generation of unskilled immigrants has been produced and their number will grow
B.
the unskilled immigrants have dragged down the wages of the natives and will continue to do so
C.
the children of unskilled immigrants have done poorly in school and will likely to drop out soon
D.
the unskilled immigrants have already been here and will certainly not return
【简答题】A．Because the Earth is heavily polluted. B．Because nature cannot recycle its resources. C．Because there are more and more people living on the Earth. D．Because no more new resources can be added.
【单选题】Researchers cannot ( ) the possibility that Earth may one day run out of its orbit.
A.
hand out
B.
drop out
C.
rule out
D.
keep out
【简答题】样品经处理后的处理液体积较大,待测试成份浓度太低,此时应进行浓缩,以提高被测组分的浓度,常用的浓缩方法有
【简答题】样品经处理后的处理液体积较大,待测试成份浓度太低,此时应进行浓缩,以提高被测组分的浓度,常用的浓缩方法有 和 。
【简答题】样品经处理后的处理液体积较大,待测试成份浓度太低,此时应进行浓缩,以提高被测组分的浓度,常用的浓缩方法有 和 。
【单选题】People feel cool when they are near a lake or an ocean because______.
A.
the earth cannot make the air over the earth hot
B.
the earth is very hot
C.
cool air from the water moves towards the land
D.
the water is colder than the earth
【单选题】Which format for citing references is not right?
A.
[10] studies the strategic implications of forward contracting in commodity markets that exhibit an oligopolistic structure.
B.
The strategic implications of forward contracting in commodity markets that exhibit an oligopolistic structure have been studied [10].
C.
Liski and Montero studied the strategic implications of forward contracting in commodity markets that exhibit an oligopolistic structure [10].
D.
Reference [10] studies the dynamic vehicle routing problem.
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