还可引入三个缺陷能级:氧空位E_ 1(E_ c - 0.17ev) 、 双空位E_2 ( E_ c-0.23eV ) 和E_3(E_c-0.39eV).The resultsdemonstrat that three electron trape ( E _ c - 0.17 eV , E _ c - 0.23 eV, E _ c - 0.39 eV ) produced inp ￣ + nn ￣ + structures are ch...
锹和耙的手柄较长，可发挥较好的杠杆作用。The spade and fork have longer shafts, providing better leverage.将土耙松，把种子种在土里，然后轻轻地盖上土。Rake the soil, press the seed into it, then cover it lightly.她把炉灰从锅炉里面耙了出来。She raked out the ashes from the boile...
He stopped the machine and replayed the message.他停下机器，重新播放了一遍信息。He rewound the tape and replayed a few bits and pieces.他倒好磁带, 又播放了几小段录音。Drawn matches were replayed three or four days later.没有分出胜负的比赛在三四天后重赛。Time - replaye...
梨树被嫁接到榅的根茎上。Pear trees are grafted on quince rootstocks.苹果树很容易嫁接.Apples are easily grafted.在温带地区一年以上的嫁接植株通常比一年生的成活率高.In temperate regions more than one - year - old often survive better than one - year - old plants....