A pneumatic tire having land sections with acute Angle sections, in which the level of air columntube resonance sound is reduced with uneven wear resistance maintained at high level.
一种充气轮胎，其包括具有锐角部的陆部，不仅能维持耐单边磨损性能，还能降低气柱共鸣声声级。
2
A thermometer often now, and more often back in the early 1800s, consists of a glass tube up which a column of mercury or alcohol can travel from a reservoir at the base.
现在常见的温度计由一个玻璃管和一个位于底部的贮液槽组成，贮液槽中的水银或酒精沿玻璃管上升形成液柱。
3
The precision of liquid column manometer was described. The correct use method and error correction of U tube manometer and double tube differential pressure gauge were analysed.