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【单选题】
真空吸盘要求工件表面 干燥清洁,同时气密性好。A.
粗糙
B.
凹凸不平
C.
平缓突起
D.
平整光滑
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知识点：
皮皮学刷刷变学霸
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【简答题】聚合酶链式反应(polymerase chain reaction，PCR)
【简答题】聚合酶链反应(polymerase chain reaction, PCR)
【简答题】聚合酶链式反应(PCR，polymerase chain reaction)
【简答题】Polymerase Chain Reaction,PCR
【简答题】Why did the writer and his family choose to live in the country? Do you think their dream has come true? Why?
【单选题】Why does the writer suggest that you put yourself in the other side's position?
A.
because they may have lied about what they want
B.
in order to avoid being trapped into making a deal you cannot change
C.
because it is likely that they have more to offer than you do
D.
in order to be able to see your real value to them
【单选题】Enzymes necessary for the Polymerase Chain Reaction (PCR) include:
A.
Restriction enzyme, DNA ligase.
B.
Primers, DNA polymerase.
C.
DNA polymerase.
D.
DNA polymerase, DNA ligase.
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