题目内容

主键约束是非空约束和唯一约束的组合

A. 对
B. 错

查看答案
更多问题

Conversation 1[音频]

A. She used to take long walks in the hills.
B. She got very tired from walking her dog.
C. She worked very hard in the woods last week.
D. She once wore high-heeled shoes during a long walk.

Conversation 2[音频]

Add more sweets to Coke at the party.
B. Have a barbecue party in the backyard.
C. Add flavor to the barbecue sauce with Coke.
D. Prepare more Coke for the barbecue party.

Conversation 3[音频]

A. $45.
B. $50.
C. $55.
D. $60.

Conversation 4[音频]

A. She is too intimidated to speak in front of others.
B. She is not very confident in her own figure.
C. She has started doing exercise at home.
D. She is waiting for a class to start now.

答案查题题库