下列哪些函数是调和函数？( ) A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/30a8b864644b4f27953e4f399dc4d71c.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/96069e2a68cd483195966ca8c29148cf.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/4182d5dc35bd4c61a1d6d7770aeb455f.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/a862359c882e445498961560101f6776.png" />

下列函数在定义域上为单调增函数的是（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/211e70b83e274d979fe0f82e370dde04.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/592975f906cc4dcc93af5cf8efb72a6c.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/5af23319fbba416db4948cf10778b93c.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/429b274252eb4b1dbd6dfeb4e8513b9b.png" />

下列函数中，是最小项表达式形式的是:（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/34e21d54f83e44bf87fa52c84ad2def7.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/0a2d63f5d74e4c8e9dae1d6f59d7e5cb.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/d0e6740d7fb74cc4b0ba08aa2ee3ff6c.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/6cd1ba0e55434c8380db3b3478d99f04.png">

量子力学为什么要用算符表示力学量？表示力学量的算符为什么必须是线性厄密的？

线性谐振子的第一激发态的波函数为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/aab7a58985f443ed91a9f4036d4b56dd.png" />,其位置几率分布最大处为 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/44c963c6379540a099bfd79da6501b42.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/dff9139c15174797b8b68ef230d1ee90.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/ad088197932f430db9416ebf9d5b47fa.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/17949074010c4d44ad48b416055aaa86.png" />