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【简答题】
一定量的某种理想气体进行如图所示的循环过程。已知气体在状态 A 的温度为 T A = 300 K ,求: (1) 气体在状态 B 、 C 的温度; (2) 各过程中气体对外所作的功; (3) 经过整个循环过程,气体从外界吸收的净热量 ( 各过程吸热的代数和 ) 。
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【简答题】紫外一可见分光光度法用于药物的含量测定,主要有 法、 法、 法和计算分光光度法。
【单选题】In 1975 a pocket calculator cost more than $50; in 1990 a calculator of the same quality cost less than $10. Which of the following explanations is most consistent with these facts?
A.
Intense competition in the calculator industry caused the supply curve for calculators to shift to the left, depressing the price.
B.
An increase in the demand for calculators led to the price drop.
C.
An improvement in technology caused the supply of calculators to increase, depressing their price.
D.
As the population grew, fewer expensive calculators were needed, causing prices to fall.
【单选题】采用紫外-可见分光光度法测定药物含量时，含有杂原子的有机溶剂提出了要求，以下哪一种准确
A.
使用范围均不能小于截止使用波长
B.
使用范围可以小于截止波长
C.
没有特殊要求
D.
使用范围对测定结果无影响
【单选题】The world price of a simple electronic calculator is $5.00. Before Zimbabwe allowed trade in calculators, the price of a calculator there was $7.50. Once Zimbabwe began allowing trade in calculators w...
A.
importing calculators and the price of a calculator in Zimbabwe decreased to $5.00.
B.
importing calculators and the price of a calculator in Zimbabwe remained at $7.50.
C.
exporting calculators and the price of a calculator in Zimbabwe decreased to $5.00.
D.
exporting calculators and the price of a calculator in Zimbabwe remained at $7.50.
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