And that now must be the frictional force, because NP is still the frictional force.
这肯定是摩擦力，因为NP还是摩擦力。
Force Protection produces the basic vehicle, with U.K. company NP Aerospace modifying the machine to local requirements.
ForceProtection公司生产了该基本车辆，与英国的NP航空航天公司一起修改该机器以满足当地的要求。
Force Protection produces the basic vehicle, with U.K. company NP Aerospace modifying the machine to local requirements.
ForceProtection公司生产了该基本车辆，与英国的NP航空航天公司一起修改该机器以满足当地的要求。
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