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When training over-active dogs, we should focus on training and developing their inhibition gradually, strictly following the principle of “step by step, from simple to complex”.()
答案:
正确
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The physiological significance of atrioventricular postponement is
A、prevent complete tetanic contraction of the myocardium
B、enhance ventricular muscle contractility
C、to prolong the effective refractory period of myocardium
D、avoid synchronous contraction of atria and ventricles
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当钢筋混凝土梁件产生应力裂缝时,可采用( )方法使裂缝封闭。
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B 填缝
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