Large volumes of carbon dioxide are safe and effective for fighting fires in enclosed spaces，such as in a pumproom，provided that the（）.
A. persons in the space wear gas masks
B. persons in the space wear damp cloths over their mouths and nostrils
C. ventilation system is secured and all persons leave the space
D. ventilation system is kept operating
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电力市场管理制度对各单位的用电设备和管理范围作出明确界定。
A. 正确
B. 错误
Which two statements about the implementation of WLAN QoS are true？（）
A. The 802.11e standard is the IEEE 802.11 OoS WLAN standard.
B. The Wi-Fi Multimedia （WMM） standard decreases the eight priority levels to four access categories.
C. The Wi-Fi Multimedia （WMM） standard is a Wi-Fi Alliance standard that increases the four priority levels to eight access categories.
D. The Wi-Fi Multimedia （WMM） standard is an IEEE standard that increases the four priority levels to eight access categories.
E. 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.
F. Wireless OoS designs and implementations commonly use Layer 3 differentiated services code point （DSCP） or Layer 2 802.1 p to ensure priority
在注射模中，根据各零件与塑料的接触情况，可以将模具的组成零件分为（）和（）两类。
学生处收集系部推优资料并审核，经专门评审会议讨论确定后报（）审定
A. 院长办公会
B. 教务处
C. 系部
D. 团委
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