皮皮学，免费搜题
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【单选题】
引起限制性通气不足的原因之一是
A.
白喉
B.
支气管哮喘
C.
气管异物
D.
多发性肋骨骨折
E.
肺泡水肿
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参考解析：
知识点：
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举一反三
【单选题】一般工作环境下
A.
安全工频电流为50mA，安全工频电压为100V
B.
安全工频电流为30mA，安全工频电压为50V
C.
安全工频电流为50mA，安全工频电压为36V
D.
安全工频电流为50mA，安全工频电压为24V
查看完整题目与答案
【单选题】工厂车间变电所单台主变压器的容量一般不宜超过( )。
A.
1000kV.A(或1250kV.A)
B.
630kV.A
C.
800kV.A
D.
2000kV.A
查看完整题目与答案
【多选题】Why do we think that the ribosome is a ribozyme?
A.
The rRNAs are folded into highly compact, precise three-dimensional structures that form the core of the ribosome. In contrast to the central positioning of the rRNAs, the ribosomal proteins are generally located on the surface, where they fill the gaps and crevices of the folded RN
B.
The main role of the ribosomal proteins seems to be to help fold and stabilize the RNA core, while permitting the changes in rRNA conformation that are necessary for this RNA to catalyze efficient protein synthesis.
C.
Not only are the three tRNA-binding sites (the A, P, and E sites) on the ribosome formed primarily by the rRNAs, but the catalytic site for peptide bond formation is formed by the 23S rRNA of the large subunit; the nearest ribosomal protein is located too far away to make contact with the incoming amino acid or with the growing polypeptide chain.
D.
The catalytic site in this RNA—a peptidyl transferase—is similar in many respects to that found in some protein enzymes: it is a highly structured pocket that precisely orients the two reactants—the elongating polypeptide and the amino acid carried by the incoming tRNA—thereby greatly increasing the likelihood of a productive reaction.
查看完整题目与答案
【单选题】Recently, I bought a new apartment(公寓), _______ was high.
A.
which price
B.
the price of which
C.
its price
D.
the price of whose
查看完整题目与答案
【简答题】Which ONE of the following statements is FALSE ?A. Secondary structural elements fold in three dimensions to result in the final native protein. B. Some proteins do contain only alpha-helices and no b...
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【单选题】配电所一般为户内型，单台变压器容量不宜超过( )，一般为2台，进线两回。
A.
600kV?A
B.
620kV?A
C.
630kV?A
D.
650kV?A
查看完整题目与答案
【判断题】对于临时来访的来宾,秘书也应该“有求必应”。
A.
正确
B.
错误
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【单选题】箱式变电站一般用于配电室建设改造困难的情况，如架空线路入地改造地区、配电室无法扩容改造的场所，以及施工用电、临时用电等，其单台变压器容量一般不宜超过（）。
A.
820kVA
B.
630kVA
C.
540kVA
D.
320kVA
查看完整题目与答案
【判断题】虚拟货币就是非真实的货币。
A.
正确
B.
错误
查看完整题目与答案
【简答题】安全攻击分为 () 攻击和 () 攻击。
查看完整题目与答案
相关题目：
【单选题】一般工作环境下
A.
安全工频电流为50mA，安全工频电压为100V
B.
安全工频电流为30mA，安全工频电压为50V
C.
安全工频电流为50mA，安全工频电压为36V
D.
安全工频电流为50mA，安全工频电压为24V
查看完整题目与答案
【单选题】工厂车间变电所单台主变压器的容量一般不宜超过( )。
A.
1000kV.A(或1250kV.A)
B.
630kV.A
C.
800kV.A
D.
2000kV.A
查看完整题目与答案
【多选题】Why do we think that the ribosome is a ribozyme?
A.
The rRNAs are folded into highly compact, precise three-dimensional structures that form the core of the ribosome. In contrast to the central positioning of the rRNAs, the ribosomal proteins are generally located on the surface, where they fill the gaps and crevices of the folded RN
B.
The main role of the ribosomal proteins seems to be to help fold and stabilize the RNA core, while permitting the changes in rRNA conformation that are necessary for this RNA to catalyze efficient protein synthesis.
C.
Not only are the three tRNA-binding sites (the A, P, and E sites) on the ribosome formed primarily by the rRNAs, but the catalytic site for peptide bond formation is formed by the 23S rRNA of the large subunit; the nearest ribosomal protein is located too far away to make contact with the incoming amino acid or with the growing polypeptide chain.
D.
The catalytic site in this RNA—a peptidyl transferase—is similar in many respects to that found in some protein enzymes: it is a highly structured pocket that precisely orients the two reactants—the elongating polypeptide and the amino acid carried by the incoming tRNA—thereby greatly increasing the likelihood of a productive reaction.
查看完整题目与答案
【单选题】Recently, I bought a new apartment(公寓), _______ was high.
A.
which price
B.
the price of which
C.
its price
D.
the price of whose
查看完整题目与答案
【简答题】Which ONE of the following statements is FALSE ?A. Secondary structural elements fold in three dimensions to result in the final native protein. B. Some proteins do contain only alpha-helices and no b...
查看完整题目与答案
【单选题】配电所一般为户内型，单台变压器容量不宜超过( )，一般为2台，进线两回。
A.
600kV?A
B.
620kV?A
C.
630kV?A
D.
650kV?A
查看完整题目与答案
【判断题】对于临时来访的来宾,秘书也应该“有求必应”。
A.
正确
B.
错误
查看完整题目与答案
【单选题】箱式变电站一般用于配电室建设改造困难的情况，如架空线路入地改造地区、配电室无法扩容改造的场所，以及施工用电、临时用电等，其单台变压器容量一般不宜超过（）。
A.
820kVA
B.
630kVA
C.
540kVA
D.
320kVA
查看完整题目与答案
【判断题】虚拟货币就是非真实的货币。
A.
正确
B.
错误
查看完整题目与答案
【简答题】安全攻击分为 () 攻击和 () 攻击。
查看完整题目与答案