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【单选题】
冈崎片段是在()催化下在RNA引物的3'羟基端逐个加上脱氧核糖核苷酸而形成的。A.
DNA聚合酶 I
B.
DNA聚合酶 II
C.
DNA聚合酶 III
D.
引发酶
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【简答题】请简单说一说,为什么有些鸟戴着脚环?
【简答题】阴维脉维系、联络全身的()经;阳维脉维系、联络全身的()经。
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【简答题】小题1:The car is too e__________, we don’t want to buy it. 小题2: The box is very h______. I can’t carry it. 小题3:The boy doesn’t like studying and he didn’t pass the e_____. 小题4:We went to the History M__...
【简答题】确切、确实 1. ( )做到师生互助。 2.把比作运输队长是非常( )的。
【单选题】Last week I gave my little sister a toy plane, but it the next day. [ ]
A.
will gone
B.
has gone
C.
will be gone
D.
was gone
【单选题】Sorry, it is _______ to carry a toy gun onto the plane.
A.
allowed
B.
permitted
C.
prohibited
D.
not forbidden
【单选题】As a speeding train crosses a trestle over a deep gorge, a child drops his toy plane from the window. The path of the toy plane is modeled by , where y is the height above the floor of the gorge and d...
A.
7.5 ft
B.
30 ft
C.
120 ft
D.
900 ft
E.
11 ft
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