【简答题】CHECK约束被称为______约束,UNIQQUE约束被称为_______约束。
【单选题】清除试管内壁沾染的苯酚,可以选用的试剂是
【判断题】《威尼斯宪章》更多地关注历史纪念物保护的原真实性和整体性。()
【多选题】印刷包装材料要求设置专门区域妥善存放,未经批准人员不得进入,避免混淆,要置于密闭容器内储运的( )。
【单选题】______, it was completed on time.
A.
Difficult as the task was
B.
Difficult as was the task
C.
As the task was difficult
D.
As was the task difficult
【多选题】印刷包装材料要求设置专门区域妥善存放,未经批准人员不得进入,避免混淆,要置于密闭容器内储运的是()
【简答题】CHECK 约束被称为 约束,UNIQUE约束被称为 约束。