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| 71. | When a body is at rest, or in motion with constant velocity, the external force acting upon it are in equilibrium. |
| 当物体处于静止或作匀速运动时，作用在其上的外力是平衡的。 |
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| 72. | The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. |
| 物体的加速度与所受的合外力成正比，与物体的质量成反比。 |
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| 73. | Aluminum conductor XLPE insulated fine steel wire armored low-smoke and non-halo sheathed Flame-retardant power cable. |
| 室内、隧道、电缆沟、竖井等能承受机械外力和一定拉力的场所。 |
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| 74. | If a body is kept free of the action of forces, it will remain in its state of rest or of uniform motion in a straight line. |
| 物体如果不受外力的作用，将保持静止的状态或沿直线作匀速运动。 |
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| 75. | For laying in doors, in tunnels and in cable trench, able to bare external mechanical forces and certain puling force. |
| 室内、道、缆沟、井等能承受机械外力和一定拉力的场所。 |
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| 76. | Methods External forces were exerted on various locations of cross action forceps to have their jaws opened. The external force and the arm of force were quantified and the moment was calculated. The clip force was calculated according to the regression equation of arm of force and moment. |
| 方法 根据力矩测算夹持力 :在反向镊的不同部位施加外力 ,使镊尖张开 ,测量外力的大小及作用力臂 ,计算力矩 ,根据力臂 力矩回归方程计算夹持力 ; |
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| 77. | For laying indoors,in trenchesin ducts and in ground,able tobear heavier pulling force,andfor fixed installation. |
| 敷设在室内、电缆沟、管道、直埋等能承受较大机械外力等固定场合。 |
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| 78. | When several external forces act on a body, we may wish to consider the works of the separate forces. |
| 当几个外力作用于一个物体时，我们可能希望考查各个力所作的功。 |
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| 79. | Acceleration always has the direction of the net force, regardless of the direction of the velocity. |
| 加速度的方向总是与净外力的方向一样，而与速度的方向无关。 |
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| 80. | This tests your knowledge of the principles of vector addition and the summation of forces around a point. |
| 这个测试你对向量加法原理及作用于同一点的外力总合的认知。 |
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