题目内容

已知某省山区、丘陵、湖区幼儿体格发育有较大的差异，现需制定该省婴幼儿体格发育有关指标的参考值范围，抽样方法最好采取（）

A. 分层抽样
B. 单纯随机抽样
C. 系统抽样
D. 整群抽样
E. 机械抽样

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Whenever a failover takes place on the ASA （configured for failover）， all active connections are droppedand clients must re-establish their connections unless：（）

A. The ASA is configured for Active-Standby failover.
B. The ASA is configured for Active-Activefailover.
C. The ASA is configured for Active-Active failover and a state failover link has been configured.
D. The ASA is configured for Active-Standby failover and a state failover link has been configured.
E. The ASA is configured to use a serial cable as the failover link.
F. The ASA is configured for LAN-Based failover

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