在关系数据库中,用来表示实体之间联系的是______。
A.树结构
B.网结构
C.线性表
D.二维表
参考答案:D
第一节根据句子意思及提示完成句子。
小题1:It is my __________ (相信) that good manners are very important to everybody.
小题2:Everybody ___________ (钦佩) him for his fine sense of humor.
小题3:Nobody can enter the lab without the teacher’s ____________ (允许).
小题4:It’s important to know your own s____________ and weaknesses.
小题5:We should keep a b____________ diet if we want to be in good shape.
小题6:Seeing the happy s____________ of her children playing in the garden, the mother didn’t feel upset any more .
小题7:The country _________ its __________(屏息) to see who would win the election in the early morning.
小题8:You should have ____________ ___________(道歉)your roommate, John. What you said yesterday hurt him deeply.
小题9:They stood there, ___________ _________ (怒视) each other without a word.
对结构砼所用粗集料的常规抽检项目有哪些?