一台980转/分的三相异步电动机，其极对数为（）。 ["1","2","3","4"]
The ORACLE_SID environment variable is set to +ASM. ASMLIB is not used in the configuration. You executed the following command to startup the Automatic Storage Management (ASM) instance. SQL> STARTUP; Which two activities are performed during a successful start up operation? （）(Choose two.) [" The databases configured to use the ASM instance are mounted"," The disk groups are mounted as per the ASM_DISKGROUPS initialization parameter"," ASM starts the Oracle Cluster Synchronization Services (CSS) daemon if it is not started"," ASM discovers and examines the contents of all files that are in the paths specified in the ASM_DISKGROUPS initialization parameter"]
联合体各方签订共同投标协议后，可以再以自己名义单独投标，也可以组成新的联合体或参加其他联合体在同一项目中投标。
简述临床药理学研究的内容。
You need to generate a list of all customer last names with their credit limits from the CUSTOMERS table. Those customers who do not have a credit limit should appear last in the list. Which two queries would achieve the required result?（） ["SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit DESC","SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit","SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit NULLS LAST","SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_last_name, cust_credit_limit NULLSLAST"]
风机或水泵的转动部分由（）和（）组成。
