再生沥青混合料的性能试验指标不包括（）。 ["空隙率","饱和度","流值","密度"]
宋词繁荣的主要原因是什么？
1985年，日本《职业训练法》被更名为《人力资源开发促进法》
合并单元格的组合键是（） ["Ctrl+Shift+M","Ctrl+Alt+M","Alt+Shift+M","Ctrl+M"]
Which three concerning the use of the java.io.Serializable interface are true？（） [" Objects from classes that use aggregation cannot be serialized."," Art object serialized on one JVM can be successfully deserialized on a different JVM."," The values in fields with the volatile modifier will NOT survive serialization anddeserialization."," The values in fields with the transient modifier will NOT survive serialization anddeserialization."," It is legal to serialize an object of a type that has a supertype that does NOT implement java.io.Serializable."]
简述秦汉时期的文书工作制度
