产生激光的四能级系统中,于[img=20x22]1803d3facb4b37a.png[/img]和[img=20x22]1803d3fad3ef800.png[/img]能级之间发生粒子数反转。
举一反三
- 产生激光的四能级系统中,于[img=20x22]1803a4d24ee76ce.png[/img]和[img=20x22]1803a4d2576f74c.png[/img]能级之间发生粒子数反转。
- 某框架梁在集中标注中,注有3[img=16x21]1802e431a436367.png[/img]22;3[img=19x22]1802e431ade0adc.png[/img]20,其中3[img=19x22]1802e431ade0adc.png[/img]22为 ,3[img=19x22]1802e431ade0adc.png[/img]20为
- 考虑下面的属性文法G(S):产 生 式语 义 规 则S ® ABCprint A.num, B.num, C.num A ® [img=20x22]1803d73211b24cd.png[/img] aA.num = [img=20x22]1803d73211b24cd.png[/img].num + 1A ® εA.num = 0B ®[img=20x22]1803d7322247642.png[/img]bB.num = [img=20x22]1803d7322247642.png[/img].num + 1B ® εB.num = 0C ®[img=20x22]1803d7323424a77.png[/img] cC.num = [img=20x22]1803d7323424a77.png[/img].num + 1C ® εC.num = 0对于输入字符串aabbbc进行语法分析和属性计算,输出结果是 A: 1 2 3 B: 3 2 1 C: 2 3 1 D: 2 1 3
- 考虑下面的属性文法G(S):产 生 式语 义 规 则S ® ABC print A.num, B.num, C.num A ® [img=20x22]18035825cebcda4.png[/img] aA.num = [img=20x22]18035825cebcda4.png[/img].num + 1A ® εA.num = 0B ® [img=20x22]18035825e1973dc.png[/img] bB.num = [img=20x22]18035825e1973dc.png[/img].num + 1B ® εB.num = 0C ® [img=20x22]18035825f2dc704.png[/img] cC.num = [img=20x22]18035825f2dc704.png[/img].num + 1C ® εC.num = 0对于输入字符串aabbbc进行语法分析和属性计算,输出结果是 A: 1 2 3 B: 3 2 1 C: 2 3 1 D: 2 1 3
- 考虑下面的属性文法G(S):产 生 式语 义 规 则S ® ABC print A.num, B.num, C.num A ® [img=20x22]1803d731db39d57.png[/img] aA.num = [img=20x22]1803d731db39d57.png[/img].num + 1A ® εA.num = 0B ® [img=20x22]1803d731ec91e62.png[/img] bB.num = [img=20x22]1803d731ec91e62.png[/img].num + 1B ® εB.num = 0C ® [img=20x22]1803d731fcad3f0.png[/img] cC.num = [img=20x22]1803d731fcad3f0.png[/img].num + 1C ® εC.num = 0对于输入字符串aabbbc进行语法分析和属性计算,输出结果是 A: 1 2 3 B: 3 2 1 C: 2 3 1 D: 2 1 3