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【单选题】
已知Buck 电路的输入电压为30V，输出电压10V；输出纹波峰峰值小于100mV；输出电流最大1A，最小100mA，电路工作频率为100kHz，则要求电感必须满足条件A.
L ≥ 0.33 m H
B.
L ≥ 0.033 m H
C.
L ≤ 0.33 m H
D.
L ≤ 0.033 m H
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【单选题】She has been ________ over his strange letter for several weeks, but she still figures out nothing about it. [ ]
A.
puzzling
B.
worried
C.
troubled
D.
anxious
【简答题】物理层的主要任务是确定与传输介质有关的特性,即 特性、 特性、 功能 特性和 规程 特性。
【简答题】阅读理解。 Ever since we became pen pals, Julien has sent me strange things. Once, she sent her sneeze in a jar. ('I have a cold, can you tell?' she wrote. ) Then she sent her fingerprint. ( 'So you'll rec...
【单选题】Chinese exporters usually pack nearly all of their ___goods in containers in order to cut freight and other ______.
A.
selling …money
B.
exports …costs
C.
export …charge
D.
export …expenses
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