单项选择题

与片段TAGAp互补的片段为( )。 A．AGATp B．ATCTp C．TCTAp D．UAUAp

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单项选择题

下列不属于直接筹资的是（）。
A、吸收直接投资
B、发行股票
C、发行债券
D、
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单项选择题

2-13. Generally speaking, the Frenkel defect dominates when the radius difference between positive and negative ions is small, and Schottky defect dominates when the radius difference between the two ions is large.

A．true
B．false