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Forces are transmitted into machine members through mating surfaces, e. g., from a gear to a shaft or from one gear through meshing teeth to another gear, from a V-belt to a pulley, or from a cam to a follower. If the forces between gear teeth are too large, the oil film may be squeezed out from between them. This could result in spalling of the metal, noise, and eventual failure. 力偶 作用于同一物体上的大小相等，方向相反但不共线的两个平行力不能被合成为一个合力。作用在同一物体上的任何两个这样的力构成一个力偶。力偶的唯一作用是产生一个朝特定方向的转动或者转动趋势。 在分析由作用力引起的物体内部的应力和应变时，不能采用刚体假设。这时，我们认为物体能够变形。这样的分析通常被称为弹性体分析，这时所用的假设为，物体在作用力的范围内是弹性的。

A、cānjiā 参加

B、gēnjù 根据

C、fāxiàn 发现

D、zhùfú 祝福

A．true  B．correct

C．useful  D．acceptable

A．a high-level processor can obtain the meaning of the recognized words

B．the successful recognition system responds to the user in the form of a voice output only

C．the feedback from the higher-level processing box increases the complexity of the recognition

D．the spoken input is first recognized in the speech signal that is decoded into a series of meaningful words