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在制备乙酰水杨酸时，加入浓硫酸的作用是什么？

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制备乙酰水杨酸时，可能有哪些副产物生成？如何除去？

Multiple choice questions.1. A cheaper camera is not always ___ to a more expensive one.A. interiorB. inferiorC. exteriorD. superior2. Loneliness can make you feel empty and a sense of _ for someone to really know you.A. askingB. belongingC. longingD. looking3. A strong sense of pride _ over her as she recalled her past glory in her school days.A. weptB. sweptC. criedD. poured4. Patience is _, but its fruit is sweet.A. bitterness B. bitterC. bitteringD. bittered5. It’s important to show that you are open to teammates’ opinions, but it’s also vital that you _ on your own ideas if you believe in them.A. takeB. stickC. fastenD. impose6. No mathematician is _; he may make mistakes, but he must not hedge.A. fallibleB. fallaciousC. falseD. infallible7. He argued with his wife so vehemently that he talked himself _.A. hoarselyB. hoarsenessC. hoarseD. hoarsen8. We are certain that he will _ his illness.A. come overB. go overC. get overD. give over9. Engineering and technology are disciplines _ from one another and from science.A. differB. distinctC. distinctiveD. extinct10. Don't put that cloth over the baby's face, you'll ___ him!A. smotherB. coverC. breatheD. smooth

一个Java Application源程序文件名为MyJavaTest.java,如果使用Sun公司的Java开发工具JDK编译该源程序文件并使用其虚拟机运算这个程序的字节码文件,应该顺序执行如下两个命令: 、。

一个源文件中是否能包含2个公共类？（是/否）