比较组胺中三个氮原子的碱性[img=231x140]17a6a99ac30a020.png[/img]
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未知类型:{'options': ['[tex=4.0x1.286]5s383UpYBqxPd6jbFAB9LQ==[/tex]', '[tex=4.071x1.071]vmjNkhzII+KE8YjyWSC8Fw==[/tex]', '[tex=4.071x1.071]izdC/2qvD9dMba/zzj7vFg==[/tex]', '[tex=4.071x1.071]udFhCxw58hDgBO4Eu7fF6A==[/tex]'], 'type': 102}
举一反三
- 若 [tex=4.071x1.071]7WfzIv0AwtIkpKEKbo8cbiqYzgJIIsnnfBMqD80yMAM=[/tex], 证明[tex=3.071x1.286]uuHgk6i1hsed/QKS1tQREg==[/tex].
- 给定平面图[tex=0.786x1.0]LyvDGollVJ+xwurtsLcn0g==[/tex]如图6.17所示,平面图的面数是( ).[img=355x220]178646b659a6f03.png[/img] 未知类型:{'options': ['6', '5', '8', '9'], 'type': 102}
- 原子序数为29的元素,其原子核外电子的排布应是 未知类型:{'options': ['[tex=4.714x1.5]X/BggzUm1REIHrH4FND9C0/Ymw5mdnQ6jUIN1TNZ7sw=[/tex]', '[tex=4.714x1.5]X/BggzUm1REIHrH4FND9C7aqL/9563JqFMS9s2XfvrA=[/tex]', '[tex=4.357x1.5]D/ShzLGPu3X93d/3uubfzxqUIyS3oySkCBKRaWibULY=[/tex]', '[tex=4.357x1.5]CH76oWyhFPWId3p+4hT5PHCd4EBpOOd/aCdxxg0bSa8=[/tex]'], 'type': 102}
- 设I(x):x是整数;N(x):x是负数;S(x,y):y是x的平方命题“任何整数的平方非负”可表示为谓词公式 未知类型:{'options': ['[tex=11.929x1.357]Ab8zVcSaawMRd84sw7i/JAhyPtafOzIiYwAO+plGfU5YAO/QV3YAB0GXAXRhZ7CliwQzjDdB7FbEZsDooWfNcKY5XHTFYR6Idofr8S7Wax4=[/tex]', '[tex=11.214x1.357]Vs8Vcw/zPN7kvQW5F7NycC9PlK+v4vkWJ4hyjFXkOftd5yicp99G5Tnp+KzILEwlHDVGwqo5md6rK5TfGKT6pg==[/tex]', '[tex=11.214x1.357]Ab8zVcSaawMRd84sw7i/JPLc5lkPb0vCB3HAoQdCvLgUiouuuSbyQIQ62rJKADX6FQeTBBqnQa6q/6Qzw2KRYw==[/tex]', '[tex=10.929x1.357]mX5PRaABESRf9QDOAojNZuqee9gfCLdnz+se+AlyZp5SHDOcNaBoGKl0MgSjkAb89Uw7a1sL8h1OT0gFb59yAg==[/tex]'], 'type': 102}
- 能产生正弦波振荡的必要条件是() [br][/br] 未知类型:{'options': ['[tex=4.071x1.5]ZHMXiER8ZaDxxsVT/bVH3+lsP/UBZFV5rlr3gMkTWAo=[/tex]', '[tex=3.786x1.5]X/dAPQG629Xxhzt6x5zsxXQwhBAICzqMGDmsrceVcnk=[/tex]', '[tex=3.786x1.5]X/dAPQG629Xxhzt6x5zsxUy/rK6N2R3d20utEgygqgQ=[/tex]', '[tex=6.214x1.5]4p1ea1IYayd4Z8XNUjoBPD5L7ZWp5rKrXhXmNG5YIgo=[/tex]'], 'type': 102}