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论述社会制度的层次及特征。

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心理测验具有独特的性质，即具有（）。

A. 外显性
B. 间接性
C. 相对性
D. 客观

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发电机定子线棒在槽内固定的方法有几种？

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160km/h以上区段且线间距小于6.5m时，一般不进行车梯作业。必须进行车梯作业时，若邻线有160km/h以上列车通过，车梯和人员不能提前下道避让。

A. 正确
B. 错误

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An application needs a table for each connection that tracks the ID and Name of all items previously ordered and committed within the connection. The table also needs to be cleaned up and automatically removed each time a connection is ended. Assuming the ITEMS table was created with the following SQL statement: CREATE TABLE items item_no INT, item_name CHAR(5), item_qty INT) Which of the following SQL statements will provide the table definition that meets the specified requirements?（）

A. DECLARE GLOBAL TEMPORARY TABLE tracker AS (SELECT item_no, item_name FROM items) WITH NO DATA ON COMMIT PRESERVE ROWS ON DISCONNECT DROP TABLE
B. DECLARE GLOBAL TEMPORARY TABLE tracker AS (SELECT item_no, item_name FROM items) WITH NO DATA ON COMMIT PRESERVE ROWS
CREATE TABLE systmp.tracker AS (SELECT item_num, item_name FROM items) WITH NO DATA ON COMMIT PRESERVE ROWS
D. CREATE TABLE tracker AS (SELECT item_num, item_name FROM items) ON COMMIT PRESERVE ROWS ON DISCONNECT DROP TABLE

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