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【单选题】
The following payoff matrix shows the possible sentences that two suspects, who are arrested on suspicion of car theft, could receive. The suspects are interrogated separately and are unable to communicate with one another. Suspect 2 Confess Don't Confess Suspect 1 Confess 1: 6 years 2: 6 years 1: 1 year 2: 10 years Don't Confess 1: 10 years 2: 1 year 1: 2 years 2: 2 years Refer to Exhibit 15-1. The game is called the "Prisoners' Dilemma" because:A.
the Nash equilibrium of the game results in the lowest combined prison term.
B.
the prisoners, by acting in their own private interests, end up worse off than otherwise could be the case.
C.
when cooperation is not allowed, the prisoners each choose not to confess.
D.
the prisoners always act in solidarity, when each could individually be better off.
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【多选题】采用双指示剂法测定某一碱液，加入酚酞指示剂时，滴定消耗HCl标准溶液的体积为15.20mL；再加入甲基橙指示剂，继续滴定又消耗HCl标准溶液的体积为25.72mL，则该碱液的组成不可能是（）。
A.
NaOH
B.
Na 2 CO 3
C.
NaHCO 3 和 Na 2 CO 3
D.
Na OH 和 Na 2 CO 3
【简答题】采用酸碱滴定法测定工业碳酸钠的纯度时，以甲基橙为指示剂。为使消耗0.100mol·L -1 标准HCl溶液的体积(mL)恰好等于碳酸钠的质量分数用百分数表示的数值，问应称取碳酸钠试样多少克?[M(Na 2 CO 3 )=106.0g·mol -1 ]
【判断题】采用甲基橙为指示剂,用HCl标液滴定Na2HPO4组分,终点颜色由黄色到橙色。[已知甲基橙pH变色范围:3.1-4.4;酸色:红色;碱色:黄色]( )
A.
正确
B.
错误
【单选题】By the end of this term, we______3,000 English words in all.
A.
will learn
B.
will have learned
C.
have learned
D.
had learned
【简答题】已知某试样中可能含有 Na 3 PO 4 或 Na 2 HPO 4 、 NaH 2 PO 4 ,或某些物质的混合物,同时还有惰性杂质。取该试样 2.000g ,用水溶解,采用甲基橙为指示剂,以 0.5000 mol·L -1 HCl 标准溶液滴定,用去 32.00mL ;而用酚酞作指示剂时,同样质量的试样的溶液,只需上述 HCl 溶液 12.00 mL 滴定至终点。问试样由何种成分组成?各成分的含...
【单选题】We will have finished ________ Unit 15 by April. We can review all the lessons.
A.
learning
B.
learn
C.
learned
D.
to learn
【单选题】量取等体积的两份碱溶液,分别采用甲基橙、酚酞为指示剂,用HCl标准溶液进行滴定,消耗酸的体系为V1和V2。当2V1 = 3V2时,碱液组成为()。
A.
NaHCO3
B.
Na2CO3+NaOH,物质的量相等
C.
NaOH
D.
NaHCO3+Na2CO3,物质的量相等
【判断题】Money acts as a unit of account because we can use it to measure the relative value of goods and services.()
A.
正确
B.
错误
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