[填空题] 对10kV二级负荷供电，各电气指标实测值偏离额定值的大小，允许为：电压（），频率±0.5Hz，三相电压对称性±5%。

Which commands are used for RMAN database recovery？（） [" restore"," repair"," copy"," recover"," replace"] Which statement describes the ROWID data type? （） [" Binary data up to 4 gigabytes."," Character data up to 4 gigabytes."," Raw binary data of variable length up to 2 gigabytes."," Binary data stored in an external file, up to 4 gigabytes."," A hexadecimal string representing the unique address of a row in its table."] “了解中学生世界观、人生观、价值观形成的过程及其教育方法”是教师应具备的通识性知识。 某现浇钢筋混凝土梁的跨度为8m，针对其跨中起拱高度，下列各项中满足相关劫范的有（）。 ["2mm","5mm","15mm","20mm","30mm"] 按危机来源划分小企业遇到的危机类型，其中不包括（）。 ["供应危机","财务危机","品牌危机","战略危机"] 对10kV二级负荷供电，各电气指标实测值偏离额定值的大小，允许为：电压（），频率±0.5Hz，三相电压对称性±5%。