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【多选题】
飞机操纵系统中，为了减少“弹性间隙”所釆用的方法及其原因分析正确的是（）。A.
由于钢索的刚度低，承受拉力时，容易伸长，当飞行员操纵舵面时，舵面的偏转落后于驾驶杆或脚蹬的动作，这种由于操纵系统的弹性变形而产生的间隙称为“弹性间隙”；
B.
由于钢索的受力容易伸长而产生弹性间隙，弹性间隙过大，会使操纵的灵敏性变差；
C.
为减小弹性间隙，操纵系统中的钢索在装配时都是预先拉紧的，有预紧力的钢索能减小弹性形变。
D.
减少弹性间隙的方法是钢索预紧。其原因是、第一，钢索被预先拉紧后，就把各股钢丝绞紧，传动时钢索就不容易被拉长；第二，钢索在传动中张力增加得较少。
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A.
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