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【单选题】
根据棒的横振动方程可得,圆棒杨氏模量的计算公式为 , 其中f为A.
棒的固有频率
B.
受迫振动时的信号频率
C.
信号发生器的输出频率
D.
激振频率
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皮皮学刷刷变学霸
举一反三
【单选题】It is possible for a person to______negative attitudes and gain healthy confidence needed to realize his or her dreams.
A.
get rid of
B.
get away with
C.
get out of
D.
get along with
【单选题】我国最新的《环境空气质量标准》(GB3095-2012)中,细颗粒物(PM2.5)的浓度限值,与世界卫生组织(WHO)建议的哪一阶段目标值相同?
A.
第一过渡阶段（IT-1）
B.
第二过渡阶段（IT-2）
C.
第三过渡阶段（IT-3）
D.
指导值
【单选题】It is possible for a discontinuity smaller than the transducer to produce indications of fluctuating amplitudes as the search unit is moved laterally if testing is being per formed in the
A.
Fraunhofer zone
B.
Near field
C.
Snell field
D.
Shadow zone
【简答题】A．It is hard for the older generation to understand the young. B．It is possible for young people to live a healthier life. C．A life style. free from the poisons of life is worth striving for. D．Young ...
【简答题】A．It is hard for the older generation to understand the young. B．It is possible for young people to live a healthier life. C．A life style. free from the poisons of life is worth striving for. D．Young ...
【单选题】某交换机配置了VLAN 3/4/5,Trunk端口没有起用 GVRP 协议,现在 Trunk 端口收到一个 vlan 6 的报文,则该交换机:
A.
将这个报文泛洪到所有 VLAN 中
B.
将这个报文泛洪到 VLAN1 中
C.
将这个报文泛洪到所有 trunk 端口中
D.
丢弃这个报文
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