A.左舷錨 B.右舷錨 C.上風(fēng)舷錨 D.下風(fēng)舷錨
A.以15°~30°為宜 B.以30°~45°為宜 C.以45°~60°為宜 D.以60°~90°為宜
A.小于30° B.大于100° C.30°~60° D.50°~100°