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【简答题】
小青同学为了制作叶脉书签，打算配制125g 10％的NaOH溶液。 ⑴计算小青需要称取NaOH的质量 。 ⑵小青取上述适量溶液，将洗净的树叶放在溶液中煮沸后取出，清洗烘干。为了测定剩下的100gNaOH溶液中的溶质NaOH的质量分数，小青向该溶液中逐渐加入7.3％的稀盐酸，当溶液pH=7时，消耗盐酸50g。计算剩下的100gNaOH溶液中NaOH的质量分数。
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【判断题】天津南开区某框架剪力墙结构,应用C70混凝土做剪力墙是适宜的。
A.
正确
B.
错误
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【单选题】Which subunit of the RNA polymerase should be the best target site for the designed drug, when you want to design a new antibacterial drug that targets the prokaryotic RNA polymerase ?
A.
α subunit
B.
β subunit
C.
β’ subunit
D.
σ subunit
查看完整题目与答案
【单选题】The combination of amoxicillin and clavulanic acid into the drug known as Augmentin is widely used as an antibacterial agent. The purpose of amoxicillin in this drug is to target _____, which catalyze...
A.
transpeptidase; hexokinase; competitive
B.
peptidoglycanase; b lactamase; uncompetitive
C.
transpeptidase; b lactamase; suicide
D.
glycanprotease; penicillinase; competitive
E.
b lactamase; lysozyme; suicide
查看完整题目与答案
【多选题】下面关于热磁式氧分析仪表述正确的是()。
A.
由于热磁对流，左半边靠近磁场的电阻丝r1的热量有一部分被气流带走而产生热量损失。
B.
流经右半边电阻丝r2的气体已经是受热气体，所以r2没有或略有热量损失。
C.
被测气体中氧含量越高，磁风的流速就越大。
D.
r1和r2的阻值相差就越大，测量电桥的输出信号就越大。
查看完整题目与答案
【单选题】Which antibacterial drug act by inhibition of bacterial cell wall synthesis?
A.
penicillin
B.
streptomycin
C.
Chloramphenicol
D.
Trimethoprim
E.
Sulfonamides
查看完整题目与答案
【单选题】Which type of the following cells in the epithelial lining of the adult mammalian intestine secrets antibacterial proteins?
A.
absorptive brush-border cells
B.
Paneth cells
C.
enteroendocrine cell
D.
mucus-secreting goblet cells
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【单选题】which particle has the antibacterial properties
A.
silver nanoparticles
B.
sodium nanoparticles
C.
silicon nanoparticles
查看完整题目与答案
【单选题】3-4.Which particle has the antibacterial properties?
A.
silver nanoparticles
B.
sodium nanoparticles
C.
silicon nanoparticles
查看完整题目与答案
【单选题】Regarding the mechanism of antibacterial drugs, which of the following is wrong
A.
青霉素抑制转肽酶阻碍细菌细胞壁的合成
B.
喹诺酮类抑制DNA复制
C.
磺胺类抑制RNA转录
D.
氨基苷类抑制细菌蛋白质合成的多个环节
查看完整题目与答案
【单选题】Regarding the antibacterial action of gentamicin, which of the following statements is most accurate?
A.
Efficacy is directly proportionate to the time that the plasma level of the drug is greater than the minimal inhibitory concentration
B.
Gentamicin continues to exert antibacterial effects even after plasma levels decrease below detectable range
C.
Antibacterial activity is often reduced by the presence of an inhibitor of cell wall synthesis
D.
The antibacterial action of gentamicin is time dependent
查看完整题目与答案
相关题目：
【判断题】天津南开区某框架剪力墙结构,应用C70混凝土做剪力墙是适宜的。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Which subunit of the RNA polymerase should be the best target site for the designed drug, when you want to design a new antibacterial drug that targets the prokaryotic RNA polymerase ?
A.
α subunit
B.
β subunit
C.
β’ subunit
D.
σ subunit
查看完整题目与答案
【单选题】The combination of amoxicillin and clavulanic acid into the drug known as Augmentin is widely used as an antibacterial agent. The purpose of amoxicillin in this drug is to target _____, which catalyze...
A.
transpeptidase; hexokinase; competitive
B.
peptidoglycanase; b lactamase; uncompetitive
C.
transpeptidase; b lactamase; suicide
D.
glycanprotease; penicillinase; competitive
E.
b lactamase; lysozyme; suicide
查看完整题目与答案
【多选题】下面关于热磁式氧分析仪表述正确的是()。
A.
由于热磁对流，左半边靠近磁场的电阻丝r1的热量有一部分被气流带走而产生热量损失。
B.
流经右半边电阻丝r2的气体已经是受热气体，所以r2没有或略有热量损失。
C.
被测气体中氧含量越高，磁风的流速就越大。
D.
r1和r2的阻值相差就越大，测量电桥的输出信号就越大。
查看完整题目与答案
【单选题】Which antibacterial drug act by inhibition of bacterial cell wall synthesis?
A.
penicillin
B.
streptomycin
C.
Chloramphenicol
D.
Trimethoprim
E.
Sulfonamides
查看完整题目与答案
【单选题】Which type of the following cells in the epithelial lining of the adult mammalian intestine secrets antibacterial proteins?
A.
absorptive brush-border cells
B.
Paneth cells
C.
enteroendocrine cell
D.
mucus-secreting goblet cells
查看完整题目与答案
【单选题】which particle has the antibacterial properties
A.
silver nanoparticles
B.
sodium nanoparticles
C.
silicon nanoparticles
查看完整题目与答案
【单选题】3-4.Which particle has the antibacterial properties?
A.
silver nanoparticles
B.
sodium nanoparticles
C.
silicon nanoparticles
查看完整题目与答案
【单选题】Regarding the mechanism of antibacterial drugs, which of the following is wrong
A.
青霉素抑制转肽酶阻碍细菌细胞壁的合成
B.
喹诺酮类抑制DNA复制
C.
磺胺类抑制RNA转录
D.
氨基苷类抑制细菌蛋白质合成的多个环节
查看完整题目与答案
【单选题】Regarding the antibacterial action of gentamicin, which of the following statements is most accurate?
A.
Efficacy is directly proportionate to the time that the plasma level of the drug is greater than the minimal inhibitory concentration
B.
Gentamicin continues to exert antibacterial effects even after plasma levels decrease below detectable range
C.
Antibacterial activity is often reduced by the presence of an inhibitor of cell wall synthesis
D.
The antibacterial action of gentamicin is time dependent
查看完整题目与答案
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