【背景资料】高新技术企业新建厂区某8层框架结构办公楼工程，采用公开招标的方式选定A公司作为施工总承包，施工合同中双方约定钢筋、水泥等主材由业主供应，其他结构材料及装饰装修材料均有总承包单位负责采购。
施工过程中，发生以下事件：
事件一：钢筋第一批进场时，供货商只提供了出厂合格证，业主指令总承包单位对该批钢筋进行了现场验证，总承包单位对钢材的品种、型号、见证取样进行了质量验证。对钢筋的屈服强度、抗拉强度进行了复试。
事件二：总承包单位按《建筑工程质量管理条例》规定，对商品砼、砂石、砌墙材料、石材、胶合板实行备案证明管理。
请根据上述背景资料完成以下选项见证取样和送检数不得少于试验总数的（） ["5%","10%","20%","30%"]
Which two statements are true regarding the default behavior of the ORDER BY clause? （） ["Null values are left out of the sort.","Character values are displayed from Z to A","Date values are displayed with the earliest value first.","Null values are displayed last for descending sequences.","Numeric values are displayed with the lowest values first."]
Which three features are supported in a license for Cisco Unified Contact Center Express Enhanced? （） ["database integration ","prompt and collect ","VoiceXML ","opening and parsing HTTP and XML documents ","PQ ","E-mail Queuing&e"]
Which data dictionary views displays the error information related to a data file， when an internal read fails on that file？（） ["V$DATAFILE","V$DATAFILE_HEADER","DBA_DATA_FILES","V$DBFILE","V$DATAFILE_ERRORS"]
下列药物中，可用于治疗注意力缺陷及明显多动障碍的是（） ["利培酮","利他林","氟哌啶醇","安定","心得安"]
“一个民族已经起来”、“丰富，和丰富的痛苦”和“残缺的我”，是（）诗歌中三个常见的主题。
