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【单选题】
What American business often do to the government is to ______.A.
influence its administration
B.
contribute towards government democracy
C.
act in the government's name
D.
collaborate with government for the bottom line
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举一反三
【单选题】What is the difference between a unique constraint and a primary key constraint?
A.
A unique key constraint requires a unique index to enforce the constraint,whereas a primary key constraint can enforce uniqueness using a unique key of or nonunique index
B.
A primary key column can be NULL,but a unique key column cannot be NULL
C.
A primary key constraint can use an existing index ,but a unique constraint always creates an index
D.
A unique constraint column can be NULL,but primary key columns can not be NULL
【简答题】内毒素的主要化学成分是 ，其毒性主要是由 决定的。
【简答题】起动时依据____确定基本喷油持续时间。
【简答题】皮肤是人体面积最大的器官,由 和 组成,借 与深部组织相连。
【简答题】与G6DP缺陷有关的疾病是( )。
【单选题】What is the main idea of this passage?
A.
The difference between the primary school and the secondary school.
B.
The method that pupils get help from the teachers.
C.
The personal development of the pupils in the secondary school.
D.
The function of the secondary school.
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