而活塞环的设计在于选择合适的尺寸，使活塞环弹力满足要求的同时应力也在许可范围内。
The design of piston ring depends on the rightly selected dimensions, so that the piston ring tension can meet the demand stipulated with its stress in the allowed range.
在次梁与板中为有效利用无粘结预应力筋，建议在板厚许可的情况下尽量采用曲线形预应力筋。
Some effective measures were presented to solve bigger prestress loss of mid span in overlong frame and it is suggested that prestressed reinforcement with curve linetype …
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