题目内容

道德与其它观念一样，只有继承的一面，没有发展的一面。（）

A. 正确
B. 错误

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When you turn on the fast time constant (differentiator) control of a radar it will（）.

A. enhance weak target echoes and brighten them on the PPI
B. reduce clutter over the entire PPI by shortening the echoes
C. only suppress weak targets to a limited distance from the ship (sea clutter)
D. reduce the beam width to provide a map-like presentation for navigatio

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