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【单选题】
下列沉淀蛋白质而又不使之变性的方法是A.
中性盐沉淀
B.
有机溶液沉淀
C.
生物碱试剂沉淀
D.
重金属离子沉淀
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举一反三
【单选题】下列命题中真命题是（ ）
A.
若a≠0，则a -1 ＜a
B.
若a＞b，则|a|＞|b|
C.
若sinα= 1 2 ，则α=30°
D.
若a≠b，则（a-b） 2 ＞0
【简答题】Mo Yan’s novel, Red Sorghum, was made into a film, won the Golden Bear at the Berlin Film FestivaMo Yan’s novel, Red Sorghum, ____was made into a film, won the Golden Bear at the Berlin Film Festiv...
【单选题】Which of the following is true about the golden apple myth?
A.
The golden apple is designed as an award for the most powerful woman.
B.
The apple is finally won by the Goddess of Beauty and Love.
C.
Paris makes his judgment based on the degree of beauty he perceives in the women.
D.
The golden apple is in fact not an apple made of gold.
【单选题】下列各式中，变形正确的是（ ）
A.
若a=-2（b-2），则a=-2b-4
B.
若-2x≥4a，则x≥-2a
C.
若 1 2 a+ 1 3 b=1 ，则3a+2b=1
D.
若a=b，则a+c=b+c
【单选题】Which of the following statements about American basketball culture is not correct?
A.
Basketball was invented in early December 1891 by James Naismith, an American physical education teacher.
B.
In the American basketball culture, there are roughly three kinds of basketball forms that can represent the United States.
C.
American basketball culture is a kind of sports that takes health care, skill and performance as the basic mode and advocates etiquette, generosity and peace.
D.
The Golden State Warriors won the 2018 NBA championship.
【简答题】Marie could hardly recognize the office she went into as _______.
【简答题】Once a small boy lived on a farm which seemed so far away from everywhere. He needed to get up before sunrise every morning to help his father on the farm. During sunrise he would take a break and cli...
【单选题】Mo Yan’s novel，Red Sorghum， was made into a film，won the Golden Bear at the Berlin Film Festival in 1988．
A.
that
B.
which
C.
what
D.
it
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