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【单选题】
下列有关密码子与反密码子的叙述,正确的是 ( )A.
因为密码子有64种，而决定的氨基酸只有20种，所以每种氨基酸都对应多种密码子
B.
几乎所有的生物用一套密码子
C.
反密码子是mRNA上三个相邻的碱基
D.
DNA中密码子决定了蛋白质的氨基酸序列
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反馈参考答案：
举一反三
【单选题】Which one of the following is a project acceptance indicator given an independent project with investing type cash flows?
A.
profitability index less than 1.0
B.
project's internal rate of return less than the required return
C.
discounted payback period greater than requirement
D.
modified internal rate of return that exceeds the required return
【简答题】Which type of table space must be used if you want to store the index data
separately from the table data?
【简答题】Which type of futures contract does NOT allow for the underlying goods to be deliveredA. Interest rate.B. Index.C. Foreign currency.
【单选题】蛙成体的心脏组成
A.
静脉窦、 1 心房、 1 心室
B.
静脉窦、 2 心房、 1 心室、动脉球
C.
静脉窦、 2 心房、 2 心室、动脉圆锥
D.
静脉窦、 2 心房、 1 心室、动脉圆锥
【单选题】The table contains a million rows for zonewise analysis in the DSS system. DML operations areperformed very rarely on the table. You decide to prepare an index on the ZONE column to enhance theperform...
A.
Bitmap index
B.
Reverse key index
C.
Normal B-Tree index
D.
Function-based index
【单选题】Which type of index changes the order in which the data is stored in a table?
A.
non-sequential；
B.
sequential；
C.
non-clustered；
D.
clustered
【单选题】The terms "bitmap," "b-tree," and "hash" refer to which type of database structure?
A.
view；
B.
function；
C.
index；
D.
stored procedure；
E.
trigger；
【单选题】Which type of futures contract does NOT allow for the underlying goods to be delivered?
A.
Interest rate.
B.
Agricultural.
C.
Index.
【单选题】Which of the following supports the XML data type?（）
A.
A unique index
B.
A composite index
C.
A check constraint
D.
A generated column
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