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【单选题】
用二维表来表示实体与实体之间联系的数据模型称为( )A.
树状模型
B.
关系模型
C.
层次模型
D.
网状模型
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皮皮学刷刷变学霸
举一反三
【单选题】- I called on you but you were not in last night. - Because I ________ supper with my parents in a restaurant. [ ]
A.
has had
B.
had
C.
was having
D.
had had
【简答题】题干: 为什么说思想与行为是思想政治教育的起点、过程与归属范畴。
【单选题】---Where ________ you last night? I called you, but got no answer. ---Sorry. I ________ out with my brother.
A.
was; were
B.
were; was
C.
did; were
D.
did; was
【单选题】--- I called you last night but you were not in. --- Yes, I dinner with my parents in the restaurant then.
A.
am having
B.
had
C.
have had
D.
was having
【单选题】铝及其合金焊件,由于其表面有一层氧化膜而增大其焊接困难,在只允许单面焊双面成型的结构上,要保证良好的内外表面质量,同时又要满足按相应标准达到焊缝要求,编工艺时用( )。
A.
钨极脉冲氩弧焊
B.
钨极氩弧焊
C.
熔化极氩弧焊
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