So that means that N of P must be in magnitude the same as the frictional force.
这意味着PN必须,在大小上,与摩擦力相同。
You have already said in your book that "If you want to be effective in self-defence you must develop internal force and practise combat applications" (The Complete Book of Tai Chi Chuan, p. 64).
你门或许都在书里读过这样的话，“如果你想达到技击目的，你就必须练习内劲，并且实践格斗技巧“（太极拳大全，第64页）。
The average force vector quantities in all area were improved after training in the left hemiplegia and the healthy people(P<0.05).
正常人和左侧偏瘫患者各区力向量均值在训练后均有明显改善（P<0.05）。
An air force spokesman, P. r. Singha, says the trials will be conducted in different stages over one year.
空军发言人辛加说，这次试飞活动将在一年内分阶段进行。
The adhesive remnant indices were recorded. Results There were statistically significant difference in both shear and tensile debonding force among four groups (P<0.01).
结果氟斑牙三个粘接组间的剪切粘接破坏力和拉伸粘接破坏力差异均有显著性（P< 0 .0 1）。
In the same subjects and different force direction, the retention forces of 3 successive measurements were significantly different (P<0.05).
相同受试者，不同施力角度，测量结果差异具有显著性（P<0.05）。
When P, mouth without compressed air, in spring force and A mouth (chamber) under the action of more than strength;
当P口无压缩空气时，在弹簧力和A 口（腔）余气力作用下；
When P, mouth without compressed air, in spring force and A mouth (chamber) under the action of more than strength;
当P口无压缩空气时，在弹簧力和A 口（腔）余气力作用下；
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