研制了一种性能优异的易切削铋黄铜来替代有毒的铅黄铜.An environmental friendly Bi - brass with cutting - free and excellent properties was developed to substitute for Pb - brass....
The harder the brake pedal is pressed, the greater the car's deceleration.刹车踩得越用力，车子减速越猛。Sudden deceleration may also result in shearing injury to the intima of the aorta.突然减速也可能造成主动脉内膜的剪式裂伤.Optimize the structure o...