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【单选题】
由于电力高峰，一个读/写磁头破坏了磁盘表面，磁盘中存储了在线储蓄账户更新和查询程序中使用的储蓄账户主文件。在发生问题时，有20个活动的出纳员终端连到了，磁盘损坏是电力波动造成的唯一物理损坏。可能的恢复步骤如下：1.重新启动在线更新和查询程序。2.从源磁盘中恢复储蓄账户主文件。3.从最近的文件备份中恢复储蓄账户主文件。4.显示每个出纳员上次的交易，让出纳员重新输入任何后续的交易。5.把最后一个完整文件恢复到主文件后，开始执行交易。6.让出纳员重新输入他们的最后一次交易。最好的恢复步骤是下面（）项顺序。A.
2，5，1，6
B.
2，5，1，4
C.
3，5，1，4
D.
3，5，1，6
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】中国历史上第一部由人民代表机关正式通过公布实施的宪法性文件是 ( ) 。
A.
1954 年宪法
B.
《中华苏维埃共和国宪法大纲》
C.
《陕甘宁边区宪法原则》
D.
《共同纲领》
【单选题】Consider the following structure:
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/55f678ade4b040cfea178859.png">
B.
is structure is best described as which of the following?
C.
An amino acid
D.
A dipeptide
E.
A tripeptide
F.
A tetrapeptide
G.
A pentapeptide
【单选题】Consider the following structure: This structure is best described as which of the following?
A.
An amino acid 氨基酸
B.
A dipeptide 二肽
C.
A tripeptide 三肽
D.
A tetrapeptide 四肽
E.
A pentapeptide 五肽
【单选题】Consider the cornfield with soil that had an amino sugar N content of 350 mg/kg in Study 2. Based on Figure 2 and other information provided, was the soil in the cornfield responsive or nonresponsive?
A.
Responsive, because the yield did not increase.
B.
Responsive, because the yield increased.
C.
Nonresponsive, because the yield did not increase.
D.
Nonresponsive, because the yield increased.
【单选题】Consider the following structure: This structure is best described as which of the following?
A.
An amino acid
B.
A dipeptide
C.
A tripeptide
D.
A tetrapeptide
E.
A pentapeptide
【单选题】Consider the amino acid shown below. The configuration about which atom will determine whether the amino acid is in the D or L configuration? 以下所示的氨基酸,哪个原子的构型将决定氨基酸是 D还是L的构型?
A.
如图
B.
如 图
C.
如图
D.
如 图
E.
如图。
【单选题】中国历史上第一部由人民代表机关正式通过公布实施的宪法性文件是()。
A.
《共同纲领》
B.
《中华苏维埃共和国宪法大纲》
C.
《陕甘宁边区宪法原则》
D.
1954年宪法
【单选题】Consider the following structure: This structure is best described as which of the following?
A.
An amino acid
B.
A dipeptide
C.
A tripeptide
D.
A tetrapeptide
E.
A pentapeptide
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