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【单选题】
From a certain farming region, trucks can carry vegetables to market in New Mexico in two days for a total cost of $ 300. A train will carry the vegetables there in four days for $200. If reducing time in transit is more important to the owner of the vegetables than is reducing the shipping bill, he or she will send the vegetables by truck. Which of the following is an assumption made in the passage above?
A.
Vegetables can be sold more profitably when shipped by train than by truck.
B.
Other than speed and cost, there are no significant differences between truck and train transportation from the farming region to New Mexico.
C.
The time required to ship vegetables by train from the farming region to New Mexico could be reduced to two days if the price for this service were raised.
D.
Most owners of vegetables in the region are more concerned with shipping costs than with the time involved in shipping vegetables to market.
E.
Transportation of vegetables by truck is worth at least $ 200 per day to owners of the vegetables in the farming region.
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【单选题】低温储存较久的血液,血浆中哪种离子浓度升高
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Na+
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K+
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A.
Na+
B.
Ca2+
C.
K+
D.
Cl—
E.
HCO3—
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A.
H\r\n +
B.
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C.
K\r\n +
D.
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