全球气候变化并不是21世纪人类发展最大的挑战之一。
以地方政府或者政府部门名义举办大型集会、焰火晚会、灯会等群众性活动，公安机关消防机构应当在接到（）通知之日起三个工作日内进行检查。 ["政府","政府部门","本级公安机关治安部门","本级公安机关"]
在CorelDRaW12默认状态下，对象的轮廓线均预设为下列哪种颜色（） ["白","黑","红","黄"]
下面（）是井道所属构件。 ["极限开关；","缓冲器；","急停钮；","到站钟"]
How does route poisoning work with holddown timers to prevent routing loops?（） [" Information learned from one source is not distributed back to that source."," Routing updates from the poisoned source are ignored until a holddown timer expires."," Failed routes are advertised with infinite metrics."," New routing updates are ignored until the network has converged."," A route is marked as unavailable when its time-to-live is exceeded."]
生态入侵
