皮皮学，免费搜题
登录
搜题
【判断题】
投影运算对应于SQL查询语句中使用SELECT子句指定用于返回的属性列表。A.
正确
B.
错误
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
【简答题】In the first sentence the author means that______. [A] it is easy to say 'I love you' [B] it is hard to say 'I love you' [C] we have many troubles in our life [D] people usually do not know when to sa...
【多选题】在风险对策中,工程保险的缺点表现在( )。
A.
机会成本增加
B.
难以确定投保人和被保险人
C.
保险合同谈判常常耗费较多的时间和精力
D.
投保人可能产生心理麻痹而导致增加实际损失和未投保损失
E.
保险人的风险增大
【单选题】In the first sentence the author means that__________.
A.
it is easy to say 'I love you'
B.
it is hard to say 'I love you'
C.
we have many troubles in our life
D.
people usually do not know when to say 'I love you'
【单选题】— You are first in the high jump. Congratulations! — _____ . [ ]
A.
Don't say so.
B.
How can you say that?
C.
Thanks a lot.
D.
That's right.
【简答题】在风险对策中，工程保险的缺点表现在（ ）。
【单选题】Before writing a book, the first thing is considering what to say.
A.
you must first ponder what to say and what not to be said carefully.
B.
it's extremely necessary that you know what to say.
C.
the first thing is to consider what to say.
D.
you must first ponder what to say and what not to say.
相关题目：