friction resistance head 摩擦阻力损失压头
Friction head loss 沿程水头损失
total friction head 总摩擦损失
Friction Head Losses 沿程水头损失
friction loss of head 沿程水头损失
Experiments are made on locomotion force, velocity, locomotion ability on surfaces with different friction coefficients, and pose of the head cabin.
对机器人的牵引力、运动速度、在不同摩擦系数介质表面上的运动能力、头舱姿态进行了试验。
First, it roughens the texture of the match head, helping to create friction wherever you strike it.
首先，它使火柴头的质感变得粗糙，有助于产生摩擦力，无论你在什么地方划火柴。
Advantages: good toughness, low friction coefficient of the ruby head, long life.
优点：有较好的韧性， 宝石头部摩擦系数低，具有超长的使用寿命。
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