【单选题】
接触网零件采用热处理和化学热处理方法，提高运动零件的制造精度，以（ ）材料的机械强度特性。___
A. 提高
B. 降低
C. 不变化
D. 调节
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答案
A
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【单选题】
全补偿链形悬挂当温度变化时，承力索和接触线均产生同方向的（ ），在补偿器的作用下，承力索和接触线的张力几乎保持不变。___
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