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【单选题】
下列有关叙述中，错误的是（ ）A.
金刚石的网状结构中，由共价键形成的最小碳环上有6个碳原子
B.
白磷分子晶体中，微粒之间通过共价键结合
C.
σ键可以单独存在，π键不可单独存在
D.
H 2 O的分解温度及沸点都比H 2 S的事实不可都用氢键知识解释
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【简答题】Trees can produce some chemicals to protect themselves from _____ hurt.(be)
【单选题】. --- This kind of food is said to contain poisonous chemicals. --- So why not _____ it?
A.
murder
B.
arrest
C.
boycott
D.
abolish
【简答题】Some polluted waters are still beautiful because pollutants such as chemicals are hard to ______.
【多选题】关于油气聚集带,下列描述正确的是 。
A.
沉积盆地油源区或其附近长期继承性隆起带，是有利油气聚集带的重要发育部位
B.
大型富油气盆地或凹陷中央隆起带，是有利油气聚集带的重要发育部位
C.
形成较早的二级构造带总是比形成晚的二级构造带更有利于富集油气
D.
沉积盆地大型斜坡带是形成地层型或岩性型油气聚集带的有利部位
【单选题】A big difference between Kojo and Sorie was that ______.
A.
Kojo took chemicals for some useful experiment but Sorie only wasted his in an alcoholic drink.
B.
Sorie was rich but Kojo was poor
C.
Kojo had a guilty conscience but Sorie did not
D.
when Kojo objected, Sorie proved that what they were doing was reasonable
【单选题】冬冬边玩魔方边自己小声嘀咕: “转一下这面试试,再转这面呢?’这种语言被称为( )。 2013上 41
A.
角色语言
B.
对话语言
C.
内部语言
D.
自我中心语言
【单选题】Food poisoning can be caused by all the following EXCEPT________.
A.
some chemicals
B.
low temperatures
C.
some tiny living things
D.
certain natural materials
【简答题】WSK produces chemicals for use in the agricultural sector, some which are highly toxic in both liquid and gaseous states. They need to be safely stored on site after processing until they are shipped ...
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