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【单选题】
—How is your collection going? —I need one more stamp before my collection ．A.
is completed
B.
will be completed
C.
has finished
D.
will be finished
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反馈参考答案：
举一反三
【单选题】Which syntax turns an existing constraint on? （）
A.
ALTER TABLE table_name ENABLE constraint_name;
B.
ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint _ name;
C.
ALTER TABLE table_name ENABLE CONSTRAINT constraint _ name;
D.
ALTER TABLE table_name TURN ON CONSTRAINT constraint _ name;
【单选题】Which command is used to drop a constraint?
A.
ALTER TABLE MODIFY CONSTRAINT
B.
DROP CONSTRAINT
C.
ALTER CONSTRAINT DROP
D.
ALTER TABLE DROP CONSTRAINT
【单选题】Which syntax turns an existing constraint on?（）
A.
ALTER TABLE table_name ENABLE constraint_name;
B.
ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint_name;
C.
ALTER TABLE table_name ENABLE CONSTRAINT constraint_name;
D.
ALTER TABLE table_name STATUS ENABLE CONSTRAINT constraint_name;
E.
ALTER TABLE table_name TURN ON CONSTRAINT constraint_name;
【单选题】Cooling enables the engine metals _____ their mechanical properties.
A.
to retain
B.
to remain
C.
to maintenance
D.
to have
【简答题】预算约束(budget constraint)
【简答题】借贷制约(borrowing constraint)
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