Abstract : variations of flow pattern, flow velocity in deep poo l and side bar, mainstream thread, and water surface, caused by excavation project, are investigated by two - dimensional mathematical model in an orthogonal curvili near coordinate system. the change of bed - load transport rate, and redeposition r ate are predicted. the influences of the excavation project on navigation are ana lyzed. grid - type and flat - type excavation alternatives are proposed and discuss ed
文摘:採用正交曲線坐標系下的河道平面二維數學模型，研究了嘉陵江何家磧邊灘
采砂后河道流勢、流態、灘槽流速、主流位置、水面高程及比降的變化規律，預測了
采砂方案完成後
卵石推移質輸沙率變化及其對航道的影響，並對格形開挖和平整開挖方案進行了比較分析
The sterility caused by male factors were excluded form this study. 1. natural menstrual cycle : blood samples were collected on the day 3 in the natural menstrual cycle before the coh cycle. fsh, lh, e2 were measured
1 、自然周期：所有患者于控制超排
卵周期前的自然月經周期
卵泡期（月經周期第3天）
采肘靜脈血，血清行fsh 、 lh 、 e _ 2測定。
The park s facilities include a mining history exhibition area, a maze garden, a children s play area and a fitness trail as well as a newly installed pebble walking trail and elderly fitness equipment
公園內的設施包括一個介紹馬鞍山
采礦歷史的露天展覽場地、迷宮式的花園、設計新穎的兒童游樂場、健體緩跑徑，以及最新設置的
卵石徑及適合長者使用的健身器材等等。
According to video - recording in the field and computing by making programs, several gravel parameters, such as perimeter, area, long and short axis etc., were gained and the appearance coefficient and variety along the river were computed
通過野外
采樣錄象，室內編程計算，初步得到
卵石的周長、面積、長短軸等基本參數，計算了形狀系數及其沿程的變化規律。
Artificial egg taking
人工
采卵
Unselective fishing methods and fry collection during the spawning season compromise the sustainability of the local fisheries industry
一網打盡的捕魚方式，以及在產卵期間采捕魚苗，均會削弱本地漁業的可持續發展。
