无沟

褶皱面表面被覆浓密纤毛，分有沟嵴和无沟嵴两部分，界限明显。

The ridged surface is divided into two parts : one is folded into deep ridges and groove , but the other is no.

UHF无线电波在无分支沟道中的传播特性

UHF Radio Propagation Characteristics in Straight Open groove Structures

尾椎为7个，无脉管沟。肋为13～14对，其中，胸骨肋为8对。

The number of coccygeal vertebrae was 7 . There were 13-14 pairs of costae .

实践证明，采用成形切入磨削的加工方法，能够实现无油沟滚道的加工。

Practice has proved that using formation infeed grinding processing method can process raceway without oil groove .

快干浇注料在高炉无备用主沟砂口上的应用

Application of Fast Dried Castable in the Only Sand Port of Main Runner in BF

为计算无断面资料沟道中的水流演进和泥沙冲淤过程，提出了采用扩散波方法和悬移质不平衡输沙模式的模拟方法。

Flow discharge in channels was routed by using a 1D diffusive wave method , and sediment transport was simulated according to non-equilibrium transport of suspended load .

无斗颈堑沟电耙底部结构及应用

The Bottom Structure and Application of Non neck Trenching Electric Rake

结果变形链球菌是无龋组窝沟的优势耐酸菌，且中性条件下检出较多；

Results S.mutans was the predominant aciduric bacteria in fissures of caries-free children and more frequently recovered at neutral pH.