【简答题】一、设教学数据库有三个关系: 学生关系 Student(SNo, SName,SAge,S ); 课程关系 Course(CNo,CName,Teacher); 选课关系 SC(SNo,CNo,Grade ) 使用关系代数分别执行以下查询操作: (1) 检索学习课程号为 C2 的学生学号与成绩。 (2) 检索学习课程号为 C2 的学生学号与姓名。 (3) 检索选修课程名为 MATHS 的学生...
【多选题】成本的作用主要包括( )。The role of cost mainly includes ( ).
A.
成本是计量经营耗费和确定补偿尺度的重要工具Cost is an important tool for measuring operating expenses and determining compensation scale
B.
成本是决定商品价格的基础,是使产品具有竞争力的前提条件Cost is the basis for determining commodity prices and the prerequisite for competitiveness of products.
C.
成本是企业进行决策和核算经济效益的重要因素Cost is an important factor for enterprises to make decisions and calculate economic benefits.
D.
成本是衡量企业管理水平和各方面工作成果的重要指标 Cost is an important indicator to measure the level of enterprise management and the results of various aspects of work.
【单选题】The little girl who would become the world’s most magical actress _______ an anonymous refugee confronting life’s horrors and fragility firsthand.
【简答题】Translate the following sentences into Chinese or English. Translate the sentences into Chinese. The little girl who would become the world's most magical actress began as an anonymous refugee confron...
【单选题】王明,男,6岁,玩耍时不慎摔倒,右侧脸部挫裂伤,需要进行清创手术,以下护理正确的是
【单选题】Lloyd Company produces music boxes. The standard factory overhead cost at 100% of normal capacity is $100,000 (20,000 hours at $5: $3 variable, $2 fixed). If 700 hours were unused, the fixed factory o...
【单选题】B-E Co.’s fixed costs are $120,000, unit selling price is $30, and unit vari-
A.
le cost is $18. What is B-E’s break-even point in units?
【简答题】设教学数据库有三个关系: 学生关系 Student(SNo, SName,SAge,S ); 课程关系 Course(CNo,CName,Teacher); 选课关系 SC(SNo,CNo,Grade ) 使用关系代数表达每个查询语句 (1) 检索学习课程号为 C2 的学生学号与成绩。 (2) 检索学习课程号为 C2 的学生学号与姓名。 (3) 检索选修课程名为 MATHS 的学生学号与姓名...
【单选题】What's the meaning of this sentence: "The little girl who would become the world's most magical actress began as an anonymous refugee confronting life's horrors and fragility firsthand."
A.
这个日后将成为世界上最有魅力女星的小女孩刚开始只是一个无名难民,直面生命中恐惧和脆弱。
B.
这个日后将成为世界上最有魅力女星的小女孩起初默默无名,饱受磨难。
C.
小女孩刚开始只是一个无名难民,不得不面对生命中的恐惧和脆弱,谁能想到日后她会成为大明星呢?
D.
这个小女孩勇敢面对生命中的恐惧和磨难,最终成长为世界上最具魅力的女星。
【简答题】设有关系STUDENT(S#,SNAME,SDEPT,MNAME,CNAME,GRADE),(S#,CNAME)为候选码,设关系中有如下函数依赖: (S#,CNAME)→SNAME,SDEPT,MNAME; S#→SNAME,SDEPT,MNAME; (S#,CNAME)→GRADE; SDEPT→MNAME。 试求下列问题: (1)关系STUDENT属于第几范式?并说明理由。 (2)如果关系ST...