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【简答题】
对于三维无限深正方形势阱中粒子,若三个量子数平方和等于9,是多少? 2、下列哪些函数是 d 2 / dx 2 的 本征函数 : (1) e x , (2) e 2 x , (3)5sin x , (4) sin x +cos x , (5) x 3 。 求出本征函数的本征值 。
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【单选题】Attention, attention. This is your captain speaking. We have a miner flooding in the engine room. There is no immediate danger to crew, passengers or vessel, and there is no reason to be alarmed. For ...
A.
To go to assembly stations.
B.
To report to bridge.
C.
To remain at stations.
D.
To fight the flooding.
【单选题】检索到的图书显示“可供出借”,为什么总找不到?
A.
正被读者取出阅览或办理借阅手续;
B.
被错放在其他书架上;
C.
已丢失;
D.
已被读者还回,但还未来得及运回原地。
【单选题】Attention, attention. This is your captain speaking. We have a miner flooding in the engine room. There is no immediate danger to crew, passengers or vessel, and there is no reason to be alarmed. For ...
A.
To go to assembly stations.
B.
To report to bridge.
C.
To remain at stations.
D.
To fight the flooding.
【简答题】There is no risk to public health.
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