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【判断题】
当DNA中有蛋白质杂质时，OD260/OD280比值会增加。A.
正确
B.
错误
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举一反三
【判断题】Assets are often classified into current assets, long-term investments, plant assets, and intangible assets.
A.
正确
B.
错误
【简答题】醛固酮主要作用促进远端小管和集合管（ ）。
【判断题】Assets are often classified into current assets, long-term investments, plant assets, and intangible assets.
A.
正确
B.
错误
【单选题】熔断器应串联在被保护的电路中。正常情况下,熔断器的熔体相当于一段导线;而当电路发生短路故障时,熔体能迅速熔断( )电路,起到保护线路和电气设备的作用。
A.
并联
B.
分断
C.
串联
D.
接通
【单选题】Why does the author mention feldspar in line 10?
A.
It is often used as a substitute for clay.
B.
It is damaged by the oxides in clay.
C.
Its presence indicates inferior clay.
D.
It is a major component of clay.
【简答题】—My teacher told me never to go to school again. —Sorry to hear that.But were you often late for class? —___________. A．I was too late to study B．Well,I’m afraid I often were C．I did enjoy myself ...
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