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【单选题】
建立表结构时,由系统自动设置宽度的字段类型是A.
字符型、备注型和逻辑型
B.
日期型、数值型和字符型
C.
逻辑型、备注型和日期型
D.
浮点型、日期型和逻辑型
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举一反三
【多选题】What is human retrotransposon L1 element?
A.
One abundant human retrotransposon, the L1 element (sometimes referred to as LINE-1, a long interspersed nuclear element), is transcribed into RNA by a host cell’s RNA polymerase.
B.
A double-stranded DNA copy of this RNA is then made using an enzyme called reverse transcriptase, an unusual DNA polymerase that can use RNA as a template.
C.
The reverse transcriptase is encoded by the L1 element itself.
D.
The DNA copy of the element is then free to reintegrate into another site in the genome.
【简答题】What is symmetry element and what is symmetry operaion?
【单选题】If the number of electrons in an element increases, what do we form?
A.
an isotope
B.
a cation
C.
a new element
D.
an anion
E.
an allotrope
【单选题】What is the essential element in the dynamics of social influence?
A.
The eagerness to be accepted.
B.
The impulse to influence others.
C.
The readiness to be influenced.
D.
The inclination to rely on others.
【单选题】What is not the element in defining language?
A.
systemic
B.
arbitrary
C.
symbol
D.
visual
【简答题】What element will help fight against age spots and wrinkles? ______________________________.
【简答题】What element enables the ceramic tape to lower its temperature?
【简答题】What does the man say about an element of stress in his job?
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