数据库打完补丁后需要对数据库进行升迁，否则数据库将无法EXP导出。
参考答案：对
用custom,habit, practice和usage填空,并把句子翻译成汉语。
①It is a good _________to eat and sleep regularly.
翻译:_________________________________________________
②Social________ vary in different parts of the world.
③It's his _________to furnish references to all his quotations.
翻译:________________________________________________
④_________determines what is good English.
排球队员上衣号码应在（）。
A.0号—18号之间
B.1号—12号之间
C.1号—18号之间
D.4—22号之间
