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问题 多项选择题

下列哪种说法可以证明反应.N2＋3H2NH3已达到平衡状态（）。

A.1个N≡N键断裂的同时，有3个H—H键形成

B.1个N≡N键断裂的同时，有3个H—H键断裂

C.1个N≡N键断裂的同时，有6个N—H键断裂

D.1个N≡N键断裂的同时，有6个N—H键形成

答案

参考答案：A, C

单项选择题

投资者拟买入1手IF1505合约，以3453点申报买价，当时买方报价3449.2点，卖方报价3449.6点。如果前一成交价为3449.4点，则该投资者的成交价是（）

A.3449.2

B.3453

C.3449.4

D.3449.6
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单项选择题

Researchers have discovered a new poison, bromethalin, that is lethal to all rats, even to those species that have become immune to other poisons, as well as to those rats that eat only the most minute quantities. Tests have demonstrated that rats will not learn to avoid bromethalin and that carcasses of rats killed by bromethalin pose no threat to the well-being of other animals.
Which of the following statements, if true, would support the researchers’ claim that carcasses of rats killed by bromethalin will not pose a threat to other animals

A．Rats that consume bromethalin die immediately.

B．Animals, prompted by curiosity, often examine carcasses that appear in their territory.

C．Chemicals in the digestive tract of dead rats quickly break bromethalin down into a nontoxic substance.

D．Traces of bromethalin remain in the rat’s mouth and saliva after the rat eats the poison.

E．(E) Certain animals are scavengers and feed habitually on refuse and dead flesh.
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