Precision comparison of trigonal height measurement and four-grade-leveling measurement .

全站仪三角高程测量与四等水准测量的精度比较分析。

Catheter drainage of the bladder relieves trigonal stretch and improves drainage from the upper tract .

膀胱置管引流减少三角区牵张，并改善上尿路引流。

Why did the qin army choose the trigonal pyramidal for their arrowheads ?

秦军为什么单单选择了这种三棱箭头呢？

Dual urine . Trigonal hypertrophy leads to secondary urteral obstruction owing to increased resistance to flow through the intravesical ureter .

膀胱三角区肥厚可引起继发性输尿管口梗阻，这是由于尿液通过膀胱壁部分输尿管时阻力增加而造成的。

Synthesis , crystal structures and physical properties of a series of trigonal and linear metal complexes with the pyridine - functionalized amide ligands .

啶胺配基之衍生物及其三角形与直线型金属错合物之合成、构造与物理性质研究。