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【单选题】
关系数据库系统中,表的结构信息存储在A.
数据字典中
B.
指针中
C.
关系中
D.
表中
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Stranger: Excuse me, do you have small change for a dollar? Passer-by: ______
A.
Why do you want to change?
B.
Is it my business?
C.
Are dimes and quarters OK?
D.
You shouldn't ask a stranger for change.
【单选题】He says that scientists and society have a shared moral ______ for the use made of scientific discovery and invention.
A.
application
B.
service
C.
responsibility
D.
consequence
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