生态复合体概念和内容。
You are connecting to an Oracle database server from a client by using the following connect string： SQL> CONNECT hr/hr@pdserver.us.oracle.com：1521/proddb Which naming method is being used in this case？（） ["Local Naming","Easy Connect","External Naming","Directory Naming"]
通过设置一定的情境让学生自然而然地得到教育的一种教育方法叫（）。
The EMPLOYEES table contains these columns: EMPLOYEE_ID NUMBER(4) ENAME VARCHAR2 (25) JOB_ID VARCHAR2(10) Which SQL statement will return the ENAME, length of the ENAME, and the numeric position of the letter "a" in the ENAME column, for those employees whose ENAME ends with a the letter "n"?（） [" SELECT ENAME, LENGTH(ENAME), INSTR(ENAME, 'a') FROM EMPLOYEES WHERE SUBSTR (ENAME, -1,1) = 'n';"," SELECT ENAME, LENGTH(ENAME), INSTR(ENAME, ,-1,1) FROM EMPLOYEES WHERE SUBSTR (ENAME, -1,1) = 'n';"," SELECT ENAME, LENGTH(ENAME), SUBSTR(ENAME, -1,1) FROM EMPLOYEES WHERE INSTR (ENAME, 1,1) = 'n';"," SELECT ENAME, LENGTH(ENAME), SUBSTR(ENAME, -1,1) FROM EMPLOYEES WHERE INSTR (ENAME, -1,1) = 'n'"]
西美尔认为劳动分工有什么影响。
语言教育活动的"有计划"集中体现在哪些方面？
