IP地址66.168.21.121是（） ["A类","B类","C类","D类"]
You work as an application developer at Certkiller .com. You have recently created a Windows service application and need to define a Windows service class. What should you do？（） ["A","B","C","D"]
教育观察研究有哪几种分类标准，其具体类型是什么？
预制外挂墙板安装尺寸，每块外墙板垂直度允许偏差为（）。 ["A.1mm ","B.2mm ","C.3mm ","D.4mm"]
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