什么叫水面蒸发?什么叫土壤蒸发?什么叫植物散发?怎样用器测法观测这3种蒸发量?
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下脘穴的主治作用是()
A. 唇肿
B. 鼻塞
C. 呃逆
D. 座疮
以下排列中,()是立体划线正确操的步骤。
A. 立体划线有看图纸、定基准和开始划线三个步骤
B. 立体划线有看图纸、找工具和开始划线三个步骤
C. 立体划线有准备工作、实体划线和检查校对三个步骤
D. 立体划线有组织人员、安排分工和开始划线三个步骤
Which two statements are true about the roles in the Oracle database?()
A role can be granted to itself.
B. Roles are owned by the SYS user.
C. Roles can be granted to other roles.
D. A role cannot be assigned external authentication.
E. A role can contain both system and object privileges.