With a low-pitched rumbling noise, the propeller began to rotate.伴随着隆隆的低沉噪声，螺旋桨开始旋转起来。Rotate the head clockwise and counterclockwise.按顺时针方向转动头部，然后再逆时针旋转。Rotate the shoulders in their sockets five times.让肩膀绕臼部转动5次。...
This depends on the estimation of the temperatures generated by frictional heat.它取决于摩擦热所引起的温度估算.Frictional behavior is modified by colloidal silica or starch deposition.耐磨损性能可以通过在织物上沉淀胶状硅或淀粉一类物质而得到改善.The frictional dissi...