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【单选题】
若将氮原子的电子排布式写成1s22s22px22py1, 它违背A.
泡利不相容
B.
能量守恒原理
C.
能量最低原理
D.
洪特规则
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举一反三
【单选题】According to the passage, naked mole rat colonies may differ from all other known vertebrate groups in which of the following ways?
A.
Naked mole rats exhibit an extreme form. of altruism.
B.
Naked mole rats are cooperative breeders.
C.
Among naked mole rats, many males are permitted to breed with a single dominant female.
D.
Among naked mole rats, different tasks are performed at different times in an individual’s life.
E.
Among naked mole rats, fighting results in the selection of a breeding female.
【简答题】下列不属于市场失灵的领域的有() A国家公共安全 B公共医疗卫生 C法律与道德秩序 D个人生活用品
【简答题】20世纪80年代，天津市政建设跟不上，人民群众生活存在许多实际困难，“坐车没有走路快，自来水腌咸菜，临建拆得没有搭得快”，群众意见很大。市政府决心为群众办实事，一件一件地解决落实，说到做到，样样兑现。1983年，首先为市民办了10件实事，从1984年开始每年坚持为城乡人民办20年实事，到已办了130 件。如新建、改建了3000万平方米的住宅，等于解放以来前30年建房总数的3 倍，使一半以...
【单选题】According to the passage, the more protein a rat consumes, the lower will be the
A.
ratio of the rat' s blood-tryptophan concentration to the amount of serotonin produced and released in the rat's brain.
B.
ratio of the rat's blood-tryptophan concentration to the concentration in its blood of the other amino acids contained in the protein.
C.
ratio of the rat's blood-tyrosine concentration to its blood-leucine concentration.
D.
number of neurotransmitters of any kind that the rat will produce and release.
E.
number of amino acids the rat' s blood will contain.
【单选题】According to the passage, the following explanatory variables accounts for naked mole rat behavior. EXCEPT ______.
A.
age
B.
size
C.
growth rate
D.
reproductive status
【单选题】关于电气防火,下列那种做法不正确______。
A.
在冷库的绝缘层敷设电缆
B.
蓄电池问灯具开关安装在室外
C.
定期检查频繁动作的接触器主触头防止接触不良
D.
油漆间采用防爆灯具
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