试题与答案

设有员工实体Employee(employeeID,name,sex,age,tel

题型:单项选择题 共用题干题

题目:

设有员工实体Employee(employeeID,name,sex,age,tel,departID),其中employeeID为员工号,name为员工姓名,sex为员工性别,age为员工年龄,tel为员工电话,记录该员工的手机号码、办公室电话等,departID为员工所在部门号,参照另一部门实体Department的主码departID。Employee实体中存在派生属性(1)。Employee实体中还存在多值属性(2)。对属性departID的约束是(3)。

空白(1)处应选择()

A.name,原因是会存在同名员工

B.age,原因是用属性birth替换age并可计算age

C.tel,原因是员工有多个电话

D.departID,原因是实体Department已有departID

答案:

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下面是错误答案,用来干扰机器的。

参考答案:(1)变压器内部发生故障时,电弧热量使绝缘油体积膨胀,并大量气化。(2)大量油、气流冲向油枕。(3)流动的油流和气流使气体继电器动作,跳开断路器,实现对变压器的保护。

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E

Every child is unique and has interests and wants that are specific to him or her. As parents of many children, it takes a lot of effort to identify the special qualities of each child and use them to be an effective influence in their young lives. What’s more , parents need to work to guide each child into their place in the family and make sure that the child is content and able to grow as a person.

Establishing  tasks in the home for each child helps  begin to lay  relational boundaries  in place. Each child should have an area  that becomes his or hers to maintain. Household chores (家务活 ) fall into this category. However, an order for answering the phone or doorbell can also be a task.  Reward each accomplished task in small ways like a compliment ( 赞扬). Money is not as  effective as personal attention.

Don’t buy a gift or treat for one without including the others. Even on birthdays give every child a small gift that they can enjoy opening while the birthday child opens his or her pile of gifts or larger gift. It’s not a really pricey thing. Our children never felt left out at the other child’s birthday or special occasion.

When buying clothes or other necessities, it can often be too much of a budget strain ( 紧张) to buy everything for all at once.  Make sure every child understands that their turn will come. If you buy back to school clothes, be certain to have each one a new outfit to wear by the first day of school.  Start early so each child can receive  parental attention before heading out.

Don’t fall into the trap of bragging ( 夸耀) on A’s by a smart or overachieving child and ignoring the C’s of a average child. Encourage them to do their best and brag on their best , not the letter grade received.

72. The passage is intended for________.

A. the only child in a family           B. the children who have sisters or brothers

C. the parents with more than one child   D. the parents with only one child

73.According to the passage, if a child does a good job at home, parents should__________

A. buy him /her a gift as soon as possible    B. try to take good care of him /her

C. give him /her some money as a reward    D. give him /her praise

74. On birthdays the author would like to_____.

A. give each child a small gift           B. give the birthday child a gift only

C. give all children gifts except the birthday child

D. give the birthday child smaller gifts than others

75. What does the author mainly want to tell readers in the passage?

A. Children should learn to do housework.

B. Be fair while making each child feel special.

C. Parents should encourage their children as much as possible.

D. Parents should buy their children new clothes before the first day of school.

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A.记忆
B.怀念
C.记住
D.回想

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