皮皮学，免费搜题
登录
搜题
【单选题】
主码约束属于下面哪种约束A.
类型级约束
B.
属性级约束
C.
关系级约束
D.
数据库级约束
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】There are fifty students in our class, _____ of the boys _____ football.
A.
two third; likes
B.
two thirds; like
C.
two thirds; likes
【单选题】There are fifty students in our class. of us football. [ ]
A.
Two third; likes
B.
Two three; like
C.
Two thirds; likes
D.
Two thirds; like
【简答题】阅读理解 Look! This is a picture of our classroom. There are fifty desks an d chairs in it. They are for students. On the desks are our books. There is also a big desk in the classroom. It’s for our ...
【简答题】“以卮言为曼衍，以重言为真，以寓言为广”的意思是什么？
【单选题】There are fifty students in our class, _____ of us _____ football.
A.
two third; likes
B.
two three; like
C.
two thirds; likes
D.
two thirds; like
相关题目：