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初生菌丝体（primary myceliun）
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考题
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.
考题
单选题儿科就诊的年龄范围是（ ）。A
初生～10岁B
初生～12岁C
初生～14岁D
初生～15岁E
初生～16岁
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