结合实例，试述餐饮企业实施关系营销的策略。
硝酸甘油不具有下列那种作用（） 扩张容量血管。 减慢心率。 增加缺血区血流量。 扩张脑膜血管引起头痛。 增高眼内压。
A customer has requested an IBM System Storage DS8700 solution to meet the following requirements： - 20% yearly growth - 29，000 IOPS - approximately 50/50 mix of read/write operations - small （4 KB） data transfers The storage specialist has created a Disk Magic model in which each port is capable of approximately 2，900 to 3，100 IOPS. What is the minimum number of ports that should be configured on the DS8700 to handle the projected workload for the first year（） 8。 10。 12。 16。
在方案优选时，关于净现值法说法错误的是（）。 净现值法是以净现值作为方案优选比较指标。 净现值最大的方案为优选方案。 净现值法要求方案收入、费用可以定量预估。 净现值法中方案基准收益率可以不一致。
You enable block change tracking. You issue the following command: BACKUP INCREMENTAL LEVEL 0 DATABASE; The next day, you issue the following command: BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE; Which statement about the use of the change tracking file is true?（） RMAN reads the block change tracking file only when it performs the incremental level 0 backup.。 RMAN reads the block change tracking file when it performs both incremental backups.。 RMAN reads the block change tracking file only when it performs the incremental level 1 backup.。 RMAN does not read the block change tracking file when it performs either incremental backup.。
评价中心是（）
