教师将学生引入一定的问题情境，并且提供可能使问题获得解决的知识或技能，然后教师为学生确立目标，让学生进行尝试性探索的教学方式称为（）。 ["情境性教学","支架式教学","随机通达教学","自上而下的教学"]
带电检测绝缘子前应对（）进行检查。 ["电杆","拉线","检测器","金具"]
You are the network consultant from Cisco.com. Please point out which Layer 2 access designs does not support VLAN extensions?（） [" Flex Links"," loop-free U"," looped square"," looped triangle"]
政府直接配置资源，往会（）。 ["抑制市场活力","降低资源配置效率","提高资源配置效率","激发市场活力","容易滋生腐败"]
护理人员的良心具有下列哪些特点（）。 [" 以救死扶伤、治病救人为己任"," 是护理人与啊对道德责任的自觉认识和自我评价能力"," 以护理人员各种物质和精神利益的满足为前提"," 在任何情况下都不作有损于患者健康的事"," 以护理道德的基本原则作为自我评价的依据和出发点"]
使用观察法收集资料时，优、缺点有哪些？
