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【单选题】
已知总体X的分布为P{X = i} = 1/4，i = 0，1，2，3，抽取n = 36的简单随机样本X1，X2，...，X36，则E(X), D(X)分别为（ ）.A.
36 ， 54
B.
45 ， 54
C.
54 ， 36
D.
54 ， 45
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【单选题】The pH inside endosomes is about 5.0, and the pH in the cytosol is about 7.0. Calculate the amount of free energy needed to maintain this acidity difference at 37°C. Ignore the effects of the transmem...
A.
10.9 kJ/mol
B.
11.9 kJ/mol
C.
12.9 kJ/mol
D.
13.9 kJ/mol
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【单选题】Which process could be used to calculate the bond energy for the covalent bond X-Y by dividing its ∆H by n?
A.
XYn(g) → X(g) + nY(g)
B.
2XYn (g) → 2XYn-1(g) + Y2(g)
C.
Y(g) + XYn-1(g) → XYn(g)
D.
nXY(g) → nX(g) + 2n Y2(g)
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