The only noticeable evidence of its presence is how clean the floors are.

The thesis's research work is about the development of the field pump brushless DC motor controller.

论文的研究工作是围绕着油田螺杆泵用无刷直流电动机控制器的研制来开展的.

A Study of River Snail Goddess Type Korean Folktales

朝鲜族田螺娘型故事初探

Results One strain of EAggEC was isolated from the river snail and spring onion, respectively. Mouse test showed that the former could cause a mouse death rate of 66.7% while the latter 33.3%.

结果自田螺及生葱各分离出一株EAggEC，分别引起实验小鼠66.67%和33.33%死亡。

River Snail Cipangopaludina Cathayensis as an Indicator for Toxicity and Bioavailability of Heavy Metals in Sediment

用中华圆田螺作为底泥重金属毒性和生物可给性的指示生物

The Effect of pH Value Towards River Snail's Existence and Growth

pH值对田螺生存和生长的影响

Improvement in Process Precision of Spiral Shell's Bevel Gear

螺伞齿轮加工精度的提高

Spiral Shell and Tubes Heat Exchanger

螺旋壳列管式换热器

The error analysis of calculating method on reinforce concrete spiral shell

钢筋混凝土螺旋形板壳计算方法的误差分析

Freshwater or marine or terrestrial gastropod mollusk usually having an external enclosing spiral shell.

淡水、海水或陆栖的腹足纲软体动物，通常有外部包裹的螺旋壳。

Technology for Large-scale Breeding of Spiral Shell Babylonia areolata

方斑东风螺规模化苗种繁育技术研究

Cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions.

产于印度和太平洋的头足类动物，螺旋状的壳上有浅色珍珠状分隔线。

Fundamentally research on heat transfer properties of double deflection model spiral shell heat exchanger

新型双向螺旋板式换热器传热性能的初步研究

Steady array spiral shell pole type penetrate device, two penetrate saturation system, make products to be getting high-quality, melt high-aeeuracily.

稳定的直列螺杆式射出装置，二次射出饱和系统，使产品高品质化，高精密化。

A lubricant film of mucus will emerge, which separate spiral shell from the inner wall of intestine, achieving no injury drive.

螺旋外壳与肠道内壁之间将形成粘液动压润滑膜，将机器人与肠道内壁分隔开，实现无损伤驱动。

Methods The direct compression was used to check the cercaria of C.sinensis in Spiral shell's.

方法用直接压片法检查淡水螺体内的华支睾吸虫尾蚴；

Application of Matched Spiral Shell Pole Refrigeration Compressor and Economy Device

经济器和螺杆制冷压缩机配合使用初探

Any of various marine gastropods, such as a periwinkle, having a spiral shell.

任一种海栖软体动物，如滨螺，长有螺旋形的壳。

When changing and processing spiral shell's bevel gear, it is necessary to use evolute internal spline tooth shape locating taper spindle for backing processing, so as to meet different spindle precision requirements of evolute internal spline reference circle, bearing fit circle and gear pitch circle.

螺伞齿轮更换加工过程中，需使用渐开线内花键齿形定位锥度芯轴支承加工，才能达到渐开线内花键分度圆与轴承配合圆及齿轮节圆同轴精度要求。

Good-bye, old snail Bay! Good-bye, old friend!

再见了，老螺蛳湾！再见，老朋友！

Effects of Snails Feeding Rates on Size, Yield and Survival of Chinese Mitten Crab Eriocheir sinensis

螺蛳投放量对中华绒螯蟹规格、产量和成活率的影响