矿用隔爆型白炽灯适用于有爆炸危险的矿井井下各巷道及采、掘工作面照明用。
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以下FX2N可编程序控制器控制电动机星三角启动时，星形切换到三角形延时（）。
A. 1S
B. 2S
C. 3S
D. 4S
布克哈特说文艺复兴有两大发现，判断描述这两大发现的下列语句是否正确（）
A. 人的发现和自然的发现
B. 人的价值和潜能的发现及人的局限性的发现
C. 自然美的发现和自然奥秘的发现
清朝前期巩固对西藏地区管理的重要措施有（）。①平定大小和卓叛乱②派驻藏大臣③设置宣政院④册封达赖、班禅⑤设总督、巡抚
A. ②④
B. ①③
C. ②④⑤
D. ①③⑤
You need to determine where the trust boundaries will be in a new Company VOIP design. Which two statements are true about these trust boundaries？（）
A. Trust boundaries are configured in the core of the network to provide the most efficient forwarding based upon QoS markings，
B. Setting trust boundaries at the edge of the network allows intermediate hop devices to administer QoS policies without detailed packet identification.
C. Trust boundaries are used to determine which QoS mechanism will be applied to the traffic.
D. At the trust boundaries， the untrusted traffic will be marked with a new QoS value appropriate for the policy in place at the point where the traffic entered the campus network.
E. Trust boundaries define the firewall rules for QoS admission into a network.
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