不属于卫星通信技术优点的是（）。 ["覆盖面积广","数据传输量大","不受地理环境限制","性价比低"]
（）创新是自发的创新。
You work as an application developer at Certkiller .com. You have created a Windows service application for the purpose of monitoring the number of active service requests running on Certkiller .com’s server. You want to configure this Windows service application to produce a report every ten minutes. You start by placing the reporting logic in the GenerateReport method of this Windows service.You want to create a Timer object that invokes this method every ten minutes.What should you do？ （） ["A","B","C","D"]
当高处为15米至30米时，坠落半径为（） ["3米","4米","5米","6米"]
You need to recommend a strategy to ensure that the administration of AD LDS is encrypted. What should you include in the recommendation？（） ["a server authentication certificate","client authentication certificates","Digest authentication","Windows Integrated authenticatio"]
对于轴流转桨式水轮机，为什么说从结构上讲必须布置叶片密封装置？
