皮皮学，免费搜题
登录
搜题
【单选题】
早期流产是指A.
流产发生于6
B.
流产发生于6-8
C.
流产发生于8-10
D.
流产发生在12周末以前
E.
流产发生在28以前
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】According to the passage, rattlesnakes ______.
A.
play no role in controlling the population of mice and rats
B.
play a more important role than owls and hawks in reducing the number of mice and rats
C.
play a certain role in limiting the population of mice and rats
D.
play a less important role than owls and hawks in reducing the population of mice and rats
【单选题】What is the best way to share resources with other hospitals; for example, if one hospital is particularly good at dealing with influenza, how can this be shared? A. train doctors for other hospitals
A.
train doctors for other hospitals
B.
make partnerships with hospitals in other areas
C.
send doctors out to help other hospitals
D.
partner with other hospitals in influenza treatment
【简答题】关系运算中的选择运算是A)从关系中找出满足给定条件的元组的操作B)从关系中选择若干个属性组成新的关系的操作C)从关系中选择满足给定条件的属性的操作D)A和B都对
【简答题】角色扮演法(role play)
【单选题】关系运算中的选择运算是（ ）。
A.
从关系中找出满足给定条件的元组的操作
B.
从关系中选择若干个属性组成新的关系的操作
C.
从关系中选择满足给定条件的属性的操作
D.
A．和B．都对
相关题目：
参考解析：
知识点：
题目纠错 0
发布
