【多选题】下面关于TIMESTAMP类型的说法中,正确的是
A.
使用CURRENT_TIMESTAMP输入系统当前日期和时间
B.
输入NULL时,系统会输入系统当前日期和时间
【单选题】There are many common methods used to cook fish. 20 First,
B.
The easiest is to steam it.
C.
This is how you can do it.
D.
It just requires a little knowledge.
E.
The fish will go bad within hours.
F.
When buying fish,you should first smell it.
G.
The fats in fish are though to help pr heart disease.
【单选题】下面是有关date数据类型和timestamp数据类型的描述,请问哪一种描述是正确的?
C.
date数据类型比timestamp数据类型的存储时间精度高
D.
date数据类型比timestamp数据类型的存储时间精度低
【简答题】Experiments were carried out in many countries, sometimes with models driven by steam engines, but these were too heavy to be used in an airplane with a pilot.
【单选题】产品方案是指拟建项目的主要产品、辅助产品或附产品及其生产能力的组合方案。产品方案研究的内容通常不包括( )。
【简答题】_________是糖异生中最主要器官。(低阶)