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Here,therefore,we have a true radioactivity which is made evident by the emission of positive electrons. 我们因此获得了一种通过排斥正电子表现出来的真正的放射现象。
Here, therefore, we have a true radioactivity which is made evident by the emission of positive electrons. 我们因此获得了一种通过排斥正电子表现出来的真正的放射现象。
positive electron transmitting tomography 正电子传递断层摄片
Later on, we observed that aluminium and boron, when irradiated by alpha rays do not emit protons and neutrons alone, there is also an emission of positive electrons. 后来，我们观察到，铝和硼经a射线轰击，不仅仅排出质子和中子，还排出正电子。
Later on,we observed that aluminium and boron,when irradiated by alpha rays do not emit protons and neutrons alone,there is also an emission of positive electrons. 后来，我们观察到，铝和硼经a射线轰击，不仅仅排出质子和中子，还排出正电子。
There is positive proof that he did it. 有确切的证据证明他做了此事。
But the positive electrons produced by aluminium under the action of a source of alpha rays continue to be emitted for some time after removal of the source. The number of electrons emitted decreases by half in three minutes. 但是，在射线动能源作用下铝产生的正电子在动能源撤走后的相当长时间里仍继续被排斥出来，且排出的电子数量在3分钟后减少一半。
Her behaviour was a positive outrage. 她的行为残暴到了极点。
The transmitter was pulsed by an electron tube. 电子管使发射器产生脉冲波。
I'm positive she told us to meet at noon. 我肯定她是告诉我们在中午见面。
This charge is a positive charge. 这个电荷是正电荷。
An electron tube having a cathode and an anode. 电子二极管有一个阳极和一个阴极的电子管
She shows a very positive attitude to her work. 她工作态度非常积极。
Can you be positive about what you hear? 你对听到的话有把握吗？
He has a positive attitude towards life. 他对生活持有积极的态度。
The number of positive numbers is infinite. 正数的数目是无穷的。
Are you positive that you saw him? 你肯定你看到他吗?
The number of electron pairs an atom can share with other atoms. 共用电子对数，共价一个原子与其他原子共用的电子的对数
An electron with a negative charge, as contrasted with a positron. 电子带有负电荷，与正电荷相反的电子
He was positive that he had seen it in the newspaper. 他肯定他已在报纸上看见过。