• 2021-04-14
    Longitudinal wave(纵波) in a spring(弹簧) actually consist of a series of (一连串的) coupled harmonic oscillations(耦合简谐振荡), a conclusion that can be extended(推广) to longitudinal waves in all media(介质).
  • 弹簧上的纵波实际上包括一连串偶合的简谐振荡,这一结论可以推广到一切介质中的纵波上去。

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      The slow wave of gastrointestinal smooth muscle originates from <br/>&#91;&#93; A: Mucosal layer B: Serous membrane layer C: Circulatory muscle D: Longitudinal muscle E: Cajal interstitial cells

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      The main reason why spiral stirrups can improve the bearing capacity of the normal section of axial compressed columns is that ( ). A: the strength of spiral stirrups is high B: spiral stirrups can effectively restrain the longitudinal reinforcements and improve the compressive strength of longitudinal reinforcements C: spiral stirrups can effectively restrain the core concrete and improve its compressive strength D: spiral stirrups have strong deformation capacity

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      以下不属于纵向实验设计 (longitudinal design) 特点的是:

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      Which type of earthquake wave is a compressional wave? A: P-waves B: surface waves C: long waves D: S-waves

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      waves include primary wave (P-wave) and secondary wave (S-wave) .