制备乙酰水杨酸时,为什么要控制温度不超过90摄氏度,且时间不宜过长?
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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: 、 。