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【多选题】
以下属于山东5A级旅游景区的有A.
刘公岛
B.
旅游度假区
C.
龙口市南山
D.
台儿庄古城
E.
青州古城
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举一反三
【单选题】下列关于久期和凸性的说法中，错误的是（ ）。
A.
麦考利久期是指债券的平均到期时间
B.
利用久期来计算债券价格的波动性是精确值
C.
凸性是债券价格与到期收益率之间的关系用弯曲程度的表达方式
D.
凸性导致债券收益率下降所引起的债券价格上升的幅度不等于收益率同比上升所引起的债券价格下降的幅度
【单选题】What is the pH of an aqueous solution at 25.0 °C in which [H + ] is 0.00250 M ?
A.
3.4
B.
2.6
C.
-2.6
D.
-3.4
E.
2.25
【单选题】What is the pH of an aqueous solution at 25.0 °C in which [OH - ] is 0.00250 M?
A.
2.6
B.
-2.6
C.
11.4
D.
-11.4
E.
-2.25
【单选题】Which of the following enzymes would you expect to be most active in an environment where the pH was 2.0 ? What is the substrate for this enzyme?
A.
pepsin, starch
B.
Trypsin, protein
C.
amylase, starch
D.
pepsin, protein
E.
enterokinase, neutral fat
【简答题】If we want to preapre a physlogical buffer solution with pH about 7.40 at body temperature (37°C), what volume of 0.05 mol/L hydrochloride acid should be added to 100 mL of a buffer solution in which...
【单选题】Phenyl-methane-sulfonyl-fluoride (PMSF) inactivates serine proteases by binding covalently to the catalytic serine residue at the active site; this enzyme-inhibitor bond is not cleaved by the enzyme. ...
A.
irreversible
B.
competitive
C.
noncompetitive
D.
mixed
E.
pH inhibition
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