题目内容

合同履行费用负担不明确的，应当由（）

A. 合同双方当事人分担
B. 双方协商确定
C. 履行义务一方负担
D. 接受履行一方负担

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锥体护坡或导流提施工顶面高程允许偏差为（）mm。

A. ±30
B. ±40
C. ±50

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Which two statements are true about the primary key constraint in a table？（）

A. It is not possible to disable the primary key constraint.
B. It is possible to have more than one primary key constraint in a single table.
C. The primary key constraint can be referred by only one foreign key constraint.
D. The primary key constraint can be imposed by combining more than one column.
E. The non-deferrable primary key constraint creates an unique index on the primary key column if it is not already indexed.

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