皮皮学，免费搜题
登录
搜题
【单选题】
用树形结构来表示实体之间联系的数据模型是____。A.
关系模型
B.
层次模型
C.
网状模型
D.
实体联系模型
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Foreman Company’s revenues are $300 on investedcapital of $240. Expenses are currently84% of sales. If Foreman Company canreduce its expenses to 75% of sales, return on investment will be:
A.
20%
B.
31.25%
C.
93.75%
D.
None of these answers is correct.
【单选题】If Stephanie buys a laptop for $700 and the maximum she would have paid was $1,000, which of the following is true?
A.
Stephanie received consumer surplus of $1,000.
B.
Stephanie received producer surplus of $700.
C.
Stephanie received a consumer surplus of $700.
D.
Stephanie received a consumer surplus of $300.
【单选题】沿海喜食海产品的地区发生的细菌性食物中毒以下列哪项较为多见（ ）。
A.
沙门菌食物中毒
B.
肉毒杆菌食物中毒
C.
致病大肠杆菌中毒
D.
副溶血性弧菌
E.
葡萄球菌中毒
相关题目：
参考解析：
知识点：
题目纠错 0
发布
