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【单选题】
We all found_____ to play the game.A.
that interrested
B.
this interesting
C.
it interesting
D.
it's interesting
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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】压缩机属于高速转动设备,设置油泵断电联锁主要有两个目的:一是在实际生产中, 当1台油泵断电停运后,另1台油泵能够在联锁的作用下立即自动启动:二是当2台油泵同时断电时,压缩机会在( ,的作用下立即自动停止工作,即发生联锁跳车。
A.
串级
B.
联锁
C.
分程
D.
信号
【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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