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圆珠笔的英文是：
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L5 故事复诵-blank fillingListen to an aviation accident and fill in the blanks with what you've heard.[音频]As the Airbus320 approached its __1__, the crew realized that the electronic Stand Entry Guidance (SEG) system was not__2__. The Airbus captain stopped his aircraft before the __3__, but half of the aircraft __4__ the taxiway behind. Then he made a radio call to the ground controller to __5__ that the stand guidance was not __6__, but his call was not __7__. About one minute later, the crew of a Boeing triple seven called the ground controller to request pushback from __8__. The controller approved his request. But during pushback, the B777’s left wing __9__ the airbus 320’s __10__The Airbus crew made an__11__ to the ground controller. The ground controller acknowledged this urgency call and took the __12__ immediately. The airport __13__were __14__. (137 words)
二极管正向导通时，类似开关的（）。
死区电压是指在二极管应用在具体的电路中时，由于本身的压降，也就是供电电压小于一定的范围时不导通，造成输出波形有残缺，从供电电压经过零点直到输出波形残缺消失的时候，这一段电压就是死区电压。
若加在二极管上的反向电压超过击穿电压值，则二极管会损坏。
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