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【单选题】
数据库系统中用于定义和描述数据库逻辑结构的语言是( )A.
DML
B.
DDL
C.
DCL
D.
SQL
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举一反三
【单选题】听力原文：M: What's the time for departure? W: 6:30. There's only 30 minutes left to go through the Customs and have our baggage checked. Q: At what time does the conversation take place? (15)
A.
6:20.
B.
6:10.
C.
6:50.
D.
6:40.
【单选题】What's the new departure time?
A.
At 8:00.
B.
8 hours later.
C.
A few minutes later.
D.
Not mentioned.
【单选题】— What's the departure time? — ___________
A.
7:00 in the morning.
B.
It's August 30th.
C.
In September.
【简答题】What's date of the departure?
【简答题】代谢性碱中毒伴有的最常见的电解质紊乱是
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