《教师专业标准》中指出要制定（），不断提高自身专业素质。
Which of the following scenarios will ensure that the value of the NEXT_STEPNO column in a given row of table TABLEX exists as a value of column STEPNO (usually in another row) in the same table?（） Define a UNIQUE constraint on the columns NEXT_STEPNO and STEPNO.。 Define a CHECK constraint on the NEXT_STEPNO column (NEXT_STEPNO = STEPNO).。 Define column STEPNO as the primary key of TABLEX and column NEXT_STEPNO as a foreign key referencing column STEPNO of the same table.。 Define column NEXT_STEPNO as the primary key of TABLEX and column STEPNO as a foreign key referencing column NEXT_STEPNO in the same table.。
戊烷、戊烯在常温下是（）态。 气。 液。 固。 气液共存。
Your database is running in ARCHIVELOG mode. One of the data files,USERDATA01.dbf, in the USERS tablespace is damaged and you need to recover the file until the point of failure. The backup for the datafile is available. Which three files would be used in the user-managed recovery process performed by the database administrator (DBA)?（） Redo logs。 Control file。 The latest backup of only the damaged data file。 The latest backup of all the data file in the USERS tablespace。 Temporary files of temporary tablespace。 Archive Logs since the latest backup to point of failure。
高度调整阀试验时须除去杠杆（）。 下垂高度。 位移尺寸。 重量。 游隙。
按照功能差异或社区主要活动的特点来划分，社区可以分为（）。
