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【单选题】

中国古代守城时,为了防止敌人挖掘地道入城,城中设有“___”,即用陶盆覆于井口,命听觉灵敏的士兵轮流值班,以耳贴翁,倾听有无异样声音。

A.
地听
B.
天视
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】中国古代府兵制最重要的特点是()。

A.
兵农合一
B.
兵商合一
C.
兵官合一
D.
兵学合一

【单选题】人的听觉产生于()

A.
听觉感受器
B.
耳蜗
C.
鼓膜
D.
大脑听觉中枢

【单选题】听觉语音加强见于 ( )

A.
肺实变
B.
胸膜增厚
C.
肺气肿
D.
阻塞性肺不张
E.
以上都是

【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of making ads louder than the programming. In addition, t...

A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range