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【简答题】
如果DNA聚合酶把一个不正确的核苷酸加到3'端，一个含3'→5'活性的独立催化区会将这个错配碱基切去。这个催化区称为______酶。
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【简答题】将下列数字修约到个数位的0.5单位(写出计算过程) (1)60.38 (2)60.25 (3)-80.75
【简答题】将60.25修约到个数位的0.5单位是 ,将 10.2750 修约至小数点后两位 , 27.1850 修约至小数点后两位 , 4.815修约到2位小数为 。
【简答题】Juan Martinez's life is mainly about the importance of going out to nature. He said" I still can't find the words to describe the first [ 1 ] I saw those mountains." He went [ 2 ] in the Teton Mounta...
【单选题】—Hi, John, I have not seen you for a long time. What _______ recently? —Carrying on some research on wildlife. [ ]
A.
have you been doing
B.
have you done
C.
were you doing
D.
did you do
【简答题】将下列直接引语转化成间接引语 He said, "I am learning English." He says," I am tired." He said," The rain was falling yesterday." He said," I'll be seeing you off on the 10 o'clock train."
【单选题】Choose the teacher's comments about the error with the type of mistake listed A, B or C. While doing an individual drill teaching "going to," one of the students said "I going to buy some fruit." I re...
A.
slip
B.
L 1 interference
C.
error
【简答题】将数字 60.25 , 60.38 , 60.28 , -60.75 修约到“个”数位的 0.5 单位,得( )、( )、( )、( );
【简答题】He said"I like China very much." He said that ( )( ) China very much.
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