【简答题】腈纶织物产泛地用作衣物、床上用品等。腈纶是由CH 2 =CH-CN聚合而成的,CH 2 =CH-CN可以由下列反应制得: 2CH 3 -CH=CH 2 +2NH 3 +3O 2 2CH 2 =CH-CN+6H 2 O 丙烯可以由石脑油裂解制得:C 10 H 22 2C 3 H 6 +X (1)写出上述反应中X的结构简式________________________。 (2)合成高分子化合物(如腈...
【单选题】Choose the correct definition for curiosity
A.
To make an object or pattern by cutting a piece of wood or stone.
B.
To pause before saying or doing sth.
C.
To give sb. permission not to do or pay sth.
D.
The desire to know about sth.
【单选题】斩波在表示存储器的容量时,k的准确含义所指的字节数为( )。
【单选题】Choose the correct definition for terminate.
A.
The process of going down
B.
To make an object by cutting a piece of wood
C.
To pause before saying or doing sth.