SQL中的REVOKE是 ______命令。

生物多样性的保护途径有（　　）

A．就地保护

B．迁地保护

C．加强教育与法制管理

D．以上三项都是

--Today our class has a new foreign student. Could you tell me    ?

--She is American. Her name is Alia Smith. She can’t speak Chinese well, let’s help her together.

A. where she comes from

B. what her nationality is

C. where she is from

论述炎症的机理、病理变化、局部表现及结局怎样？

本地端口是SIP协议本地网络的端口，标准默认端口为（）

A.5060

B.6050

C.5006

D.6005