皮皮学，免费搜题
登录
搜题
【单选题】
有一个学生关系模式Student，其字段有no(学号)，name(姓名)，age(年龄)，sex(性别)。在这些字段中，最适合作为主键的是( )。A.
no
B.
name
C.
age
D.
sex
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】What will be sent to the pathology laboratory?
A.
Blood sample
B.
Gastric fluid sample
C.
Biopsy sample
【单选题】What will be done to help Ms. Peletz out of her predicament?
A.
She will be given a substitute item.
B.
A gift certificate will be sent to her.
C.
An inspections will be carried out.
D.
The appliance will be repaired.
【单选题】“The goods will be sent to you in about 3 weeks.” What principle does this sentence not obey?
A.
Courtesy
B.
Conciseness
C.
Completeness
D.
Concreteness
【简答题】After you have used a phone card, what will be sent to your home? It will be______.
【简答题】Listen to the recording and answer the questions. 1, What should you read before using a public phone in a foreign country? 2, What number is given to each area of the country? 3, In which countries c...
相关题目：