差头

详细讨论了主要作用力：在波浪补偿器作用下的缆绳拉力、耙头与海床间的土壤剪切力、作用在耙吸管上的水流阻力及由于压力差在耙头处产生的推动力等。

The tension force , shear forces ( including pushing force , cutting force and friction force ), impulse force , hydrodynamic drag on the suction pipes , and the force resulted from the pressure difference , etc , are the main forces for detail discussion in this paper .

但是当他靠着一张标准成长图表站着时，就可以看到他比他这个年龄应该达到的身高差了几乎一头。

But stand him against a standard growth chart and he is almost a head shorter than he should be at his age .

本文针对时间差法共焦测头中的音叉振动稳定性与时间差检测准确性的问题进行了研究。

This dissertation makes a study on the stability of the tuning fork vibration and the accuracy of the time difference detection of the confocal probe based on the time difference measurement .