多环芳烃的主要来源包括（）等。 ["燃料燃烧","有机物土壤微生物分解","甲壳类动物体内蓄积","食品的熏制和烘烤"]
ZY3500―14/32的支架最大支护高度是（）。 ["1.4m","1.8m","3.2m"]
Your customer has deployed a Cisco Wireless Location Appliance within its warehouseenvironment. However， employees there have been experiencing problems when tracking objects using activeRFID tags.You use an access point scan to determine if the Location Appliance has been deployed correctly. Making which change to warehouse deployment location services will most likely correct theproblem？（） ["ensure channels are deployed such that they do not overlap","allow for the automatic containment of rogue access points","ensure each area is covered by a minimum of three access points","ensure a minimum RSSI value of -50"]
某灌溉水库，规划设计时选用设计保证率为80%。经年径流分析计算，已求得水库所在河流断面不同频率的枯水年平均流量，见表。该断面一实际发生且径流年内分配对工程不利的枯水年来水流量见表，试确定设计枯水年径流年内分配。
发动机的性能包括哪几方面？如何评价发动机性能？
运输合理化的五要素是哪些？如何实现运输的合理化？
