However, For pipes with local resistance loss, the friction head loss caused by the viscosity of fluid does exist, which may lead to the calculation error.

但是在形成局部阻力损失的管段中，还会同时伴随产生由于液体的粘性力引起的漩程水头损失，这就造成了这项损失的计算误差。

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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。

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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。

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