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【单选题】
环境卫生学主要研究下列哪两者的关系A.
自然环境与人群健康
B.
生活环境与人群健康
C.
自然环境和生活环境与人群健康
D.
居住环境和自然环境与人群健康
E.
自然环境、‘生活居住环境、工作学习环境与人群健康
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【单选题】I had to buy of these books because I didn’t know which one was the best.
A.
both
B.
none
C.
neither
D.
all
【单选题】I didn’t know the girl you the sheep.
A.
had fed
B.
had her fed
C.
had feed
D.
had to feed
【简答题】I didn’t know I had opened Pandora’s box when I entered this room.
【单选题】I sooner but I didn’t know that they were waiting for me.
A.
had come
B.
was coming
C.
would come
D.
would have come
【简答题】某学校要对学生成绩进行计算机管理。该学校有若干学生,每个学生有学号、班级、姓名、性别、出生日期、地址。开设的课程需要管理课程编号、课程名称、学分和学生选修该课程后的成绩等信息。该学校规定:一个学生可以有选修多门课程,一门课程可以有多名学生选修。 1. 画出此管理系统的ER模型。 2. 简述ER模型向关系模式转换的一般方法。 3. 将以上ER模型转化为关系模式,包括主键、外键。 4. 试用S...
【简答题】When I was a kid I didn’t know what I wanted to be when I grew up, but I knew what I didn’t want to do. I didn’t even really know what one was. My elder brother is deaf. Growing up, I ended up defendi...
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