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问题 选择题

上海医疗器械厂科研人员研制成不用电的化学冰箱，其原理是将一种物质溶解于水时的吸热作用作冷源，达到降温目的．这种物质可能是[ ]

A、食盐

B、氢氧化钠

C、硝酸铵

D、熟石灰

答案

答案：C

选择题

He likes _____ with his friends.[ ]

A. skiping    

B. swimming    

C. skip
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单项选择题

A discussion of the economic functions of money and banking produced the following statements: Statement 1: Direct exchange of commodities is less efficient than money exchange because of the search costs involved in finding an individual with whom to trade. Statement 2: The cost of funds for borrowers is lower in an economy that features depository institutions than it would be in an economy that lacked them. Are these statements correct Statement 1 Statement 2（）①A. Correct Correct ②B. Correct Incorrect ③C. Incorrect Correct

A. ①

B. ②

C. ③
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