多级离心泵的压头等于（），而流量等于（）。
When you try to start the Database Control by using the emctl start dbconsole command the following error is displayed： TZ set to America/New_york OC4J Configuration issue. /u01/app/oracle/product/10.1.0/db_1/oc4j/j2ee/OC4J_DBConsole_orcl.us.oracle.com not found. Which two environment variables do you need to set appropriately to avoid such errors，and start the Database Control successfully？（） NLS_LANG。 ORACLE_SID。 ORACLE_HOME。 ORACLE_BASE。 LD_LIBRARY_PATH。
举例说明鱼类鳞片的主要类型。
In your multitenant container database (CDB) containing same pluggable databases (PDBs), you execute the following commands in the root container: Which two statements are true?（） The C # # ROLE1 role is created in the root database and all the PDBs.。 The C # # ROLE1 role is created only in the root database because the container clause is not used.。 Privileges are granted to the C##A_ADMIN user only in the root database.。 Privileges are granted to the C##A_ADMIN user in the root database and all PDBs.。 The statement for granting a role to a user fails because the CONTAINER clause is not used.。
依据热量因子分类：
Which three statements are true regarding persistent lightweight jobs？（）
