测站的水位与流量之间呈良好的稳定关系(单一关系),该关系往往受一断面或一个河段的水力因素控制,前者称为断面控制,后者称为河槽控制。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧