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【单选题】
()是用户与移动网之间的接口;()是移动台与基站收发信机之间的无线接口，是移动通信网的主要接口;()是基站与移动交换中心之间的接口。A.
Um接口A接口Sm接口
B.
A接口Um接口Sm接口
C.
Sm接口Um接口A接口
D.
A接口Sm接口Um接口
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【简答题】在平面机构中,一个低副能约束 个自由度?一个高副有 个自由度?(填写阿拉伯数字)
【简答题】三级管工作在放大区时,发射结 偏置,集电结 偏置。
【简答题】三级管工作在放大区,要求(
)A. 发射结正偏，集电结正偏 B. 发射结正偏，集电结反偏 C. 发射结反偏，集电结正偏 D. 发射结反偏，集电结反偏
【单选题】根据以下内容回答题：Each nation has its own peculiar character which distinguishes it from others．But the peo-pies of the world have more points in common than points in which they differ．One type of per-son th...
A.
each nation is peculiar enough to enable us to distinguish it from others
B.
the peoples of the world are as alike as they are different
C.
the peoples of the world have more similarities than differences
D.
those who do．more than is strictly necessary are common in every country
【多选题】Which two statements are true regarding single row functions?（）
A.
They accept only a single argument
B.
They can be nested only to two levels
C.
Arguments can only be column values or constants
D.
They always return a single result row for every row of a queried table
E.
They can return a data type value different from the one that is referenced
【单选题】根据以下内容回答题： Each nation has its own peculiar character which distinguishes it from others．But the peo-pies of the world have more points in common than points in which they differ．One type of per-son t...
A.
each nation is peculiar enough to enable us to distinguish it from others
B.
the peoples of the world are as alike as they are different
C.
the peoples of the world have more similarities than differences
D.
those who do．more than is strictly necessary are common in every country
【简答题】水的折射率20°C时为( ),25°C时为( )。
【多选题】Which three statements are true regarding single-row functions？（）
A.
They can accept only one argument.
B.
They can be nested up to only two levels.
C.
They can return multiple values of more than one data type.
D.
They can be used in SELECT， WHERE， and ORDER BY clauses.
E.
They can modify the data type of the argument that is referenced.
F.
They can accept a column name， expression， variable name， or a user-supplied constant as arguments.
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