usance letter of credit是什么意思

用法例句

Long-term effect of massive allograft bones implantation on defects:a more than 20 years observation;

同种异体半关节移植20年以上远期疗效评价

Observation of Long-term Effect of Interventional Therapy on Budd- Chiari Syndrome;

介入治疗布-加氏综合征远期疗效观察

Analysis of long-term results of photorefractive keratectomy for myopia;

PRK治疗近视术后远期疗效分析

Objective: Comparing the long term visual acuity,contrast sensitivity and visual symptoms of the multifocal intraocular lenses (MIOL) eyes with monofocal intraocular lenses (SIOL)eyes to evaluate the safety and effectiveness of the MIOL.

目的:比较多焦点人工晶状体(MIOL)与单焦点人工晶状体(SIOL)术后远期视力、对比敏感度和视觉现象,以评价多焦点人工晶状体的有效性和安全性。

An Empirical Study on Pricing of Renminbi Forward Exchange Rate;

人民币远期汇率定价实证分析