设两个关系C和SC如下,它们的主键分别为C#和(S#,C#),在关系SC中除属性GR

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问题:

设两个关系C和SC如下,它们的主键分别为C#和(S#,C#),在关系SC中除属性GRADE 数据类型是整型且允许空值外,其他属性的数据类型都是字符型。若要向关系SC执行插入操作,下面出的4个元组中哪一个元组可以被插入

考点:企业法律顾问企业管理知识三级数据库技术笔试
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Hearing the front door open, I ran down to the kitchen and waited. I saw my dad come in, with the white envelope in his hand. I had waited all day for this, so I reached over him for it as soon as he set foot into the house. Angrily, he      41    the envelope on the table and said that it was nothing to get excited about, and that it was just a piece of paper. I grabbed (抓取) it and ran upstairs. I wondered why my dad did not understand how      42  I was to see my mid-year report card for my first year in middle school. I was really      43     by how he refused to consider all my hard work.
I saw my class rank (等级): 1/139. I did not behave what I saw. I felt my lips (嘴唇) form a smile and wanted to run downstairs to tell everyone. Then I      44    what my dad had said--- it was nothing to get excited about. I wanted to share my happiness with someone, but felt lonely.
I realized that I had become distant (远隔的) from my family. We used to ___45______late watching Disney movies, and my brothers, sisters and I would play tennis in the backyard all the time. I wondered when all that had    46    . I just no longer took part in them. My school work     47    all my time and energy.
While I had been busy with my study, I had also built a   48   between me and my family. I was only trying to become a person everyone could be     49      of.
I wanted to go downstairs, say sorry for my rude behavior and for every refused movie and tennis game, and be    50 of my family again, I knew I had to do something--because without their support, my achievement meant nothing.
小题1:A, caught            B. cleaned up         C. pinked up        D. threw
小题2:
A.anxiousB.scaredC.sadD.frustrated
小题3:
A.beatenB.hurtC.botheredD.troubled
小题4:
A.rememberedB.realizedC.forgotD.listened to
小题5:
A.come backB.go downC.stay upD.keep out
小题6:
A.begunB.stoppedC.improvedD.appeared
小题7:
A.set upB.gave upC.used upD.put up
小题8:
A.wallB.bridgeC.roadD.house
小题9:
A.famousB.carefulC.proudD.afraid
小题10:
A.hopeB.prideC.childD.part
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低温时下列哪项参数降低

A.血液黏滞度
B.血浆容量
C.血细胞比容
D.中心静脉压
E.微循环阻力

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绞窄性肠梗阻表现为()

A.X线可见孤立充气扩大的肠袢

B.腹部扪及压痛性肿块

C.感染性休克

D.腹膜刺激征

E.以上均是

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由下列原因造成的损失和费用,航天保险保险人不承担保险赔偿责任()。

A.卫星转发器的损失

B.卫星推进剂减少导致的损失

C.卫星电能损耗导致的损失

D.外来搭载卫星引起的损失

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简述行文方式的六种类型。

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