单项选择题夜间在航机动船应显示左.右舷灯,尾灯和前低.后高两盏桅灯。长度小于50米的机动船 A、不要求显示后桅灯,但可以这样做 B、不应显示后桅灯 C、也应显示后桅灯
单项选择题Before you go scuba diving, your diving instructor will teach you the basics of scuba diving, including ______. ( ) A. the use of scuba equipment and safety rules B. how to dive beyond your limits C. how to touch corals with your hands D. walking around by your scuba fins