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问题 选择题

想一想：Ba(OH)2（固体）、CuSO4（固体）、H2SO4（液态）这些物质为什么归为一类，下列哪些物质还可以和它们归为一类（     ）

A．硝酸钠

B．75％的酒精溶液

C．Fe(OH)3胶体

D．豆浆

答案

答案：A

Ba(OH)2（固体）、CuSO4（固体）、H2SO4（液态）归类为强电解质，所以正确选项为A，硝酸钠也为强电解持；B为混合物；C为胶体；D为胶体；

单项选择题

The task at hand now is to (56) the programmers who still use yesterday’s software technology to solve today’s software problems. Object-oriented programming requires a new attitude toward problem (57) . Problem (57) with computer system becomes more natural. Application can (58) be translated into (59) . Although it is commonly believed that it will be easier to train new programmers to use object-oriented techniques than to (60) programmers who have substantial experience in applying conventional programming language constructs.

A．test

B．force

C．educate

D．touch
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判断题

一个正常的睡眠周期由正相睡眠和异相睡眠组成。
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