皮皮学，免费搜题
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搜题
【单选题】
分离分子量相近、等电点不同的蛋白质的最佳方法是( )A.
圆盘电泳
B.
醋酸纤维素薄膜电泳
C.
密度梯度离心
D.
琼脂糖凝胶电泳
E.
等电聚焦电泳
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【简答题】Why should you wear the gloves while handling hot water? This could get your hands ________.
【单选题】You ought to wear a coat, because it is freezing. Which of the following sentences could be added as a suppressed premise to make this argument valid?
A.
You ought to wear a coat when it is freezing.
B.
Coats keep you from freezing.
C.
Most people wear coats when it is freezing.
D.
Coats are made to be worn when it is freezing.
【单选题】Which of the following sentences could be added as a suppressed premise to make this argument valid? You ought to wear a coat, because it is freezing.
A.
You ought to wear a coat when it is freezing.
B.
Coats keep you from freezing.
C.
Most people wear coats when it is freezing.
D.
Coats are made to be worn when it is freezing.
【简答题】木本植物的叶脱落后在茎上留下的痕迹叫_______。
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