Console类位于下列哪个命名空间 A: System.Text B: System.IO C: System D: System.collection

在C#中,使用文件流操作类需要单独引入的命名空间是?A、B、C、D、 A: System.IO B: System.Text C: System D: System.Linq

What can we know about the Trust system from the text?.

File类包含在.NET框架中的下面哪个命名空间（）中？ A: System命名空间 B: System.Data命名空间 C: System.IO D: System.Text命名空间

1. According to the text, the similarity of naming the planets of the solar system is that they are all named after ________.

From the text we can conclude that A: home-schoolers will continue to exist. B: the education system will be reformed. C: the contradictions disappeared. D: home-schooling is a good business.

‌Annotation is defined as _____.‍‌‍ A: looking up information we do not know as we read a text B: making notes and marking up a text to better understand what we read C: making a key of markings for future reference D: a system of reading

text processing system A: n.尺度,指标 B: n. 质量,品质;特性;才能 C: n.关联,结合,协(学)会 D: 文字处理系统

C#引用系统命名空间如System.Text,是使用哪一个关键字？（ ） A: class B: public C: using D: namespace

函数$f(x)=x+\sin x$的( )。 A: 上凸区间为$(2n\text{ }\!\!\pi\!\!\text{ },(2n+1)\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$((2n-1)\text{ }\!\!\pi\!\!\text{ },2n\text{ }\!\!\pi\!\!\text{ })$ B: 上凸区间为$((2n-1)\text{ }\!\!\pi\!\!\text{ },2n\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$(2n\text{ }\!\!\pi\!\!\text{ },(2n+1)\text{ }\!\!\pi\!\!\text{ })$ C: 上凸区间为$(n\text{ }\!\!\pi\!\!\text{ },(n+1)\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$((n-1)\text{ }\!\!\pi\!\!\text{ },n\text{ }\!\!\pi\!\!\text{ })$ D: 上凸区间为$((n-1)\text{ }\!\!\pi\!\!\text{ },n\text{ }\!\!\pi\!\!\text{ })$,下凸区间为$(n\text{ }\!\!\pi\!\!\text{ },(n+1)\text{ }\!\!\pi\!\!\text{ })$