从（）起，儒家系统开始修改法律。 ["元明时期","魏晋时期","秦汉时期","战国时期"]
镁铝榴石的典型吸收光谱为（） ["红区4条弱吸收线，黄绿区为中心宽吸收带，紫区普遍吸收","典型的铁的吸收光谱，黄绿区有三条强吸收窄带","“铁窗”图式但清晰程度可能略差","紫区432nm和420nm处强的吸收窄带"]
相对密度
我国从南到北依次为（）、亚热带、温带、寒带，地带性植被分别为热带雨林和季雨林、亚热带常绿阔叶林、暖温带落叶阔叶林、寒温带针阔混交林和针叶林。
Which two statements about the implementation of WLAN QoS are true？（） ["The 802.11e standard is the IEEE 802.11 OoS WLAN standard.","The Wi-Fi Multimedia （WMM） standard decreases the eight priority levels to four access categories.","The Wi-Fi Multimedia （WMM） standard is a Wi-Fi Alliance standard that increases the four priority levels to eight access categories.","The Wi-Fi Multimedia （WMM） standard is an IEEE standard that increases the four priority levels to eight access categories.","Wireless 802.11 deploys Distributed Coordination Function （DCF）， carrier sense multiple access with collision detection （CSMA\/CD）， interframe spacing， and random wait timers to avoid collisions.","Wireless OoS designs and implementations commonly use Layer 3 differentiated services code point （DSCP） or Layer 2 802.1 p to ensure priority"]
如何控制发酵的温度？
