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继电器用其辅助设备在试验室调试完毕装回现场盘上后，还应对其（）进行校验。

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脆性断口

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结构化方法能对用户需求的变更作出快速响应。

A. 正确
B. 错误

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You execute the following set of commands to create a database user and to grant the system privileges in your production environment. SQL> CREATE USER user01 IDENTIFIED BY oracle DEFAULT TABLESPACE tbs1 TEMPORARY TABLESPACE temp PROFILE default / SQL> GRANT create session， create table TO user01； While executing the command to create a table， the user gets the following error message and the CREATE TABLE.. command fails. ERROR at line 1： ORA-01950： no privileges on tablespace What could be the possible reason for this error message？（）

A. The tablespace TBS1 is full.
B. The user is not the owner of the SYSTEM tablespace.
C. The user does not have quota on the TBS1 tablespace.
D. The user does not have sufficient system privileges to create table in the TBS1 tablespace.
E. The user does not have sufficient privileges to create table on the default permanent tablespace.

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（）通风使井下风流处于负压状态。

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