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【简答题】

锅炉水处理中最常用的钠离子树脂,是由苯乙烯和二乙烯苯共聚后,形成聚苯乙烯,再经过浓硫酸磺化处理,引入活性集团-SO3H而制成的,其中()为单体;()为交联剂;()为骨架。

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【单选题】Desperately short of living space and dangerously prone to flooding, the Netherlands plans to start building homes, businesses and even roads on water. With nearly a third of the country already cover...

A.
most parts of the country are covered by water
B.
the country is constantly threatened by floods
C.
it will promote the cultivation of flowers
D.
people think it better to live on water

【单选题】锅炉水处理测定磷酸根含量时,比色管中溶液无色说明溶液中____.

A.
无磷酸根存在
B.
磷酸根含量小
C.
磷酸根含量正常
D.
磷酸根含量偏商

【单选题】锅炉水处理程序中LR的含义是()。

A.
自锁继电器
B.
备用继电器
C.
延时继电器
D.
报警继电器