单项选择题

一个字长为6位的无符号二进制数能表示的十进制数值范围是________?
A、0~64
B、0~63
C、1~64
D、1~63

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元素的子元素用于表示哪个列是【】，而【】元素用于表示POJO和数据表中普通列的映射关系。

答案： (1)
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单项选择题

In watery solutions proteins conformation is decided by two factors:A maximum of the number of hydrogenbonding and: ( )

A．a minimize av entropy by the formation of a watery shell around the protein
B．a rotation off polar amino acid residues out against the outer shell off the protein
C．a rotation off hydrophobic amino acids sidechains towards the centre of the protein
D．minimize off hydrophobic interactions
E．maximize of ion interaction