社会志愿服务的核心是()A、助人和服务B、志愿和自愿C、义务和奉献D、组织和协调 发布时间:2019-01-31 04:51 │ 来源:www.tikuol.com 题型:单项选择题 问题: 社会志愿服务的核心是()A、助人和服务B、志愿和自愿C、义务和奉献D、组织和协调
题型:单项选择题 A snag or other underwater obstruction may form a().A.V-shaped ripple with the point of the V pointing upstreamB.V-shaped ripple with the point of the V pointing downstreamC.small patch of smooth water on a windy dayD.smoothing out of the vessel's wake 查看答案