题目内容

关于巨脉冲的描述下列正确的是

A. 峰值功率在一兆瓦以下
B. 峰值功率在一兆瓦以上
C. 脉冲宽度在几十毫秒以下
D. 脉冲宽度在几秒以下

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Three modes of languagespeechwriting(1) _______

Speech and writingspeech is considered (2) ______ because

-- (3) ______ requires reading and writing

speech and writing have (4) _____ roles

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