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【单选题】
在重组DNA技术中催化形成重组DNA分子的酶是A.
解链酶
B.
DNA聚合酶
C.
核酸内切酶
D.
DNA连接酶
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举一反三
【简答题】碳钢马氏体的组织形态主要有 状和 状,其中 状马氏体强韧性较好。
【简答题】钢中马氏体的组织形态主要有( )马氏体和( )马氏体两种。
【简答题】Find out Useful Expressions according to the specific meanings.
【简答题】碳钢马氏体的组织形态主要有 、 ,其中 强韧性较好。
【单选题】The energy sent out by the exploding star is______.
A.
100 times the energy sent out by the Sun in a year.
B.
100 million times the energy sent out by the Sun in a year.
C.
100 million times the energy sent out by the Sun in a day.
D.
100 billion times the energy sent out by the Sun in a day.
【单选题】Why couldn't Tom and Judy find out who sent them the tickets?
A.
Their friends wanted to keep it a secret.
B.
The letter with the tickets was not signed.
C.
There was no letter with the tickets.
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