【单选题】下列不饱和化合物(单体)能在一定条件下发生加聚反应生成右图物质的是( )
【单选题】In Bracken’s case, _____.
A.
anger was the factor that led to her depression
B.
anger wasn't released properly
C.
anger made her realize the significance of her living in the world
D.
anger made her despaired
【单选题】In Bracken’s case, .
A.
a. anger was the factor that led to her depression
B.
b. anger wasn’t released properly
C.
c. anger made her realize the significance of her living in the world
D.
d. anger made her despaired
【判断题】在餐桌上摆放鲜花,最早是从古罗马开始的。 (
【单选题】下列叙述中不正确的是
B.
聚乙烯是有机高分子化合物,加热时,存在一个固定的熔化温度
C.
同质量的乙烯和聚乙烯完全燃烧后生成的CO 2 的质量相等