《齐民要术•序》：“舍本逐末，贤者所非，日富岁贫，饥寒之渐，故商贾之事，阙而不录。”对这段引文理解正确的是（）。 是我国最早最完整的农书。 总结了我国6世纪前南北方劳动人民的生产经验。 含有重农抑商思想观念。 反映当时社会贫富悬殊状况。
SQ L*Loader is a utility that can perform which two tasks？（） Load data from a disk， tape， or named pipes.。 Load data into an Oracle database using DML statements.。 Extract， reorganize， and insert data within an Oracle database.。 Load data from external files into tables in an Oracle database.。 Load data into an Oracle database using operating system commands.。 Load data directly from a non-Oracle database to an Oracle database.。
我们日常所见的太阳实际是太阳的（）。 对流层。 光球层。 色球层。 日冕层。
Click the Exhibit button and examine the data in the EMPLOYEES and DEPARTMENTS tables. You want to retrieve all employees, whether or not they have matching departments in the departments table. Which query would you use?（） SELECT last_name, department_name FROM employees NATURAL JOIN departments;。 SELECT last_name, department_name FROM employees JOIN departments ;。 SELECT last_name, department_name FROM employees e JOIN departments d ON (e.department_id = d.department_id);。 SELECT last_name, department_name FROM employees e RIGHT OUTER JOIN departments d ON (e.department_id = d.department_id);。 SELECT last_name, department_name FROM employees FULL JOIN departments ON (e.department_id = d.department_id);。 SELECT last_name, department_name FROM employees e LEFT OUTER JOIN departments d ON (e.department_id = d.department_id)。
交易费用
护理木僵病人时，应将病人安置在（）
