【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 ______.
【单选题】If you annoy the cat, she will scratch you.
【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!
【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( )