微生物之间的寄生关系有（） 随意性。 可代替性。 高度专一性。 适应性。
Which daemon identifies available filesystems through the /etc/xtab file？（） nfsd。 biod。 rpc.lockd。 rpc.mountd。
Which of the following are valid until command options when attempting point-in-time recovery in RMAN？（） until time。 until change。 until sequence。 until SCN。 until commit。
Which statement adds a constraint that ensures the CUSTOMER_NAME column of the CUSTOMERS table holds a value?（） ALTER TABLE customers ADD CONSTRAINT cust_name_nn CHECK customer_name IS NOT NULL;。 ALTER TABLE customers MODIFY CONSTRAINT cust_name_nn CHECK customer_name IS NOT NULL;。 ALTER TABLE customers MODIFY customer_name CONSTRAINT cust_name_nn NOT NULL;。 ALTER TABLE customers MODIFY customer_name CONSTRAINT cust_name_nn IS NOT NULL;。 ALTER TABLE customers MODIFY name CONSTRAINT cust_name_nn NOT NULL;。 ALTER TABLE customers ADD CONSTRAINT cust_name_nn CHECK customer_name NOT NULL。
静安区教育学院附中创造的后茶馆式教学体现了（）的理念。
The customer has both a Windows SAN and a separate UNIX SAN. Each of these is managed bya different group. The UNIX group has a need for more resources and no available funding. Whatis the first question the storage specialist should ask?（）
