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【简答题】
合成聚氯乙烯所用的单体氯乙烯,多由乙炔和氯化氢以氯化汞为催化剂合成得到,反应式如下 通常反应原料中氯化氢过量20%。若反应器出口中氯乙烯摩尔分数为80%,试分别计算乙炔和氯化氢的转化率。
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【简答题】When the boy and the young woman met again years later
【单选题】A man should love the woman he marries.
A.
Nnaemeka
B.
Nnaemeka's father
C.
Both Nnaemeka and his father
【单选题】A woman in her 60s gave birth to two test tube babies three years ago, after her only daughter died of gas poisoning.
A.
slightly
B.
eventually
C.
approximately
D.
directly
【简答题】真菌的有性 生殖过程可以分为 ( )、( ) 和 ( )。
【简答题】真菌的有性生殖过程可以分为______，______和______三个阶段。
【单选题】When was the woman's brother in New Zealand?
A.
Three years ago.
B.
Two years ago.
C.
Ten years ago.