【单选题】存储器是计算机中的记忆设备,它主要用来存放( )。
【单选题】给出下列关系:1 ;20∉N ;3Ø ⫋{x||x|<0}; 4 ,其中,正确的个数是( )
【简答题】给出下列关系:(1) 3 3 ?{x|x≤ 17} ;(2) 3 ∈Q ;(3)|-6|?N * ;(4)0∈φ,其中正确的个数为 ______.
【多选题】存储器是计算机系统中的记忆设备,用来存放程序和数据,以下选项中属于存储器的是
【单选题】Why didn't the customer notice the scratch on the product?
A.
Because he was in a big hurry.
B.
Because he didn't check the product.
C.
Because the box was tightly sealed.
D.
Because the scratch was invisible.
【判断题】Dalong said France is so romantic!
【单选题】给出下列四个关系式: 1 ;20.3∉Q;30∈N;40∈{0} 其中正确关系式的个数有
【判断题】Dalong said France is so romantic!
【简答题】A.beginning B.start C.zero D.scratch
【单选题】给出下列四个关系:π∈R,0?Q,0.7∈N,0∈?,其中正确的关系个数为( )