You work as a network technician at Company. Your boss， Ms.， is interested LWAPP （Lightweight Access Point Protocol）. In particular she wants to know which type of activities this protocol defines. What should you tell her？ （） [" Layer 3 addressing and distribution"," SNMP monitoring services"," Access point certification and software control"," Packet encapsulation， fragmentation， and formatting"," Compression and Layer 3 address mapping"," User behavior"]
春季晚霜冻主要危害幼苗期的作物、蔬菜、瓜类、（）的果树等。 ["休眠期","坐果期","落叶期","果实膨大期"]
简述气盛言宜说。
简述流行性腮腺炎的主要临床症状及其并发症。
2012年，全国城镇居民人均可支配收入（）元，比上年增长12.6%。 ["24567","24565","25678","26789"]
凝集原
