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【判断题】
每年年初,除了少数明细账不必更换新账外,总账、日记账和大部分明细账,都必须更换新账。( )
A.
正确
B.
错误
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参考答案:
举一反三
【简答题】在“氧气、氮气、二氧化硫、二氧化碳、稀有气体”中选择适当的物质填空: (1)用于制造硝酸和化肥的是______; (2)引起温室效应的主要气体______; (3)空气中含量较多且化学性质比较活泼的气体______; (4)可制成五光十色霓虹灯的是______.
【多选题】What is the biological and pharmaceutical role of D-amino acids?
A.
Although D-amino acids do not generally occur in proteins, they do serve some special functions in the structure of bacterial cell walls and peptide antibiotics.
B.
Bacterial peptidoglycans contain both D-alanine and D-glutamate. D-Amino acids arise directly from the L isomers by the action of amino acid racemases, which have pyridoxal phosphate as cofactor. Amino acid racemization is uniquely important to bacterial metabolism, and enzymes such as alanine racemase are prime targets for pharmaceutical agents.
C.
One such agent, L-fluoroalanine, is being tested as an antibacterial drug. Another, cycloserine, is used to treat tuberculosis.
D.
Because these inhibitors also affect some PLP-requiring human enzymes, however, they have potentially undesirable side effects.
【单选题】根据船舶吨税法律制度的规定,下列船舶中,不予免征船舶吨税的是( )。
A.
捕捞渔船
B.
非机动驳船
C.
养殖渔船
D.
军队专用船舶
【简答题】What are amino acids?
【单选题】What has a significant position in the growth of human body tissues?
A.
Essential amino acids.
B.
Non-essential amino acids.
C.
Fat.
D.
Proteins.
【单选题】空气里含有①氧气、②氮气、③稀有气体、④二氧化碳及其它气体和杂质,这些气体在空气中的体积分数按由大到小顺序排列正确的是(  )
A.
①②③④
B.
②①③④
C.
①②④③
D.
②①④③
【单选题】根据船舶吨税法律制度的规定,下列船舶中,不予免征船舶吨税
A.
捕捞渔船
B.
非机动驳船
C.
养殖渔船
D.
军队专用船舶
【判断题】湿空气中的干空气是由氮、氧、二氧化碳和微量的稀有气体(氦、氖、氩、氪、氙等)组成的混合气。
A.
正确
B.
错误
【单选题】空气中的氮气、氧气、二氧化碳和稀有气体的体积百分比依次为 ( )o
A.
(A)87.08%、11.90%、0.03%、0。99%
B.
(B)78.08%、11.90%、3.3%、6.72%
C.
(C)68.08%、20.90%、6.72%、4。3%
D.
(D)78.08%、20.90%、0.03%、0.94%
【单选题】下列哪种方法不能调换图层
A.
特性
B.
特性匹配
C.
帮助
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