搜题请搜索小程序“爱下问搜题”
问题
问答题 简答题
请举出几例不可展曲面。
答案
参考答案：
球面；
抛物面；
双曲面等。
选择题
His mother suggested he ____ to see the doctor, because his pale face suggested he ____ ill.
A. would go, had been
B. go, was
C. went, had been
D. must go, was
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单项选择题
DDL是( )。
A．操纵数据库语言
B．定义数据库的语言
C．自含语言
D．宿主语言
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