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所谓效率是指 。
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由于功率放大电路的电压和电流都要有足够大的输出幅度，即工作在大信号状态，因此常采用图解法进行分析。
电火花加工的英文简写为？
1.什么是特种加工？
Listen to a passage about The Great Plague of London and fill in the blanks.The Great Plague of London (1664 — 1666) was an_______(1)of bubonic (鼠疫) plague that ___________(2)London and was particularly violent during the hot months of August and September of 1665. In one week, 7,165 people died of the plague. The total number of deaths was about 70,000 of a total population __________(3)at 460,000. The disease was carried by _________(4)that lived on black rats. It was generally_____________(5), and its effects were terrible — fever and __________(6), swelling of the lymph glands, eventual ____________(7)and death. Most of the______________(8)was in the city’s outskirts, in areas where the poor were densely crowded. Those who could, including most doctors, lawyers and ____________(9), fled the city. All trade with London and other plague towns was stopped, but from 1667 only sporadic cases appeared until 1679. The plague’s decline was___________(10)to various causes, including the Great Fire of London.
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