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【简答题】
气体扩散速率,它与气体的分压差、气体的温度、扩散面积以及气体在液体中的溶解度成 ,与气体分子量的平方根和扩散距离成 。
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【单选题】p81 下列关于会计信息质量要求的说法不正确的是( )。
A.
谨慎性的应用允许企业设置秘密准备
B.
谨慎性要求企业不应高估资产或者收益、低估负债或者费用
C.
可比性要求企业提供的会计信息应当相互可比
D.
会计政策前后各期应保持一致，不得随意变更，体现的是可比性
【单选题】下列关于会计信息质量要求的说法不正确的是()。
A.
谨慎性的应用允许企业设置秘密准备
B.
谨慎性要求企业不应高估资产或者收益、低估负债或者费用
C.
可比性要求企业提供的会计信息应当相互可比
D.
会计政策前后各期应保持一致,不得随意变更,体现的是可比性
【简答题】为了解基因结构，通常选取一特定长度的线性DNA分子，先用一种限制酶切割，通过电泳技术将单酶水解片段分离，计算相对大小；然后再用另一种酶对单酶水解片段进行降解，分析片断大小。下表是某小组进行的相关实验。 (1)该实验设计主要体现了__________________原则。 (2)由实验可知，在这段已知序列上，A酶与B酶的识别序列分别为______个和_____个。 (3)根据表中数据，请在下图中标出...
【单选题】Why does Tom ask Sally and John to call him?
A.
He wants to meet them at the station.
B.
He wants to invite them to dinner.
C.
He wants them to visit his family.
【单选题】Nobody believed his reason for being absent from the class ________ he had to meet his uncle at the airport.
A.
why
B.
that
C.
where
D.
because
【单选题】Nobody believed his reason for being absent form the class _____ he had to meet his uncle at the air port. [ ]
A.
why
B.
that
C.
where
D.
because
【简答题】Nobody believed his reason for being absent form the class _____he had to meet his uncle at the airport. A．why B．that C．where D．Because
【简答题】A．He wants to meet them at the concert. B．He wants to make up for their loss. C．He wants to rob them on their way to the concert. D．He wants to rob their house.
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