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【简答题】
正确填写下表的空格 工频电源 仪用蜂鸣器 某高频感应炉电源 频率/Hz 50 角频率/rad·s -1 6280 周期/s 5×10 -6 某中波电台 某短波电台 电视4频道中心频率 频率/Hz 1314×10 3 角频率/rad·s -1 157×10 6 周期/s 0.0125×10 -6
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刷刷题刷刷变学霸
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【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-mo-distant future when all autos will be abandoned and allowed to rust. Other authorities, how...
A.
keep in the right lane
B.
wait to arrive at his destination
C.
keep in constant touch with the computer center
D.
inform the system of his destination by phone
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, ho...
A.
How to render automobiles pollution-free.
B.
How to make smaller and safer automobiles.
C.
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D.
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