单项选择题
To develop maximum anchor holding power，the optimum angle between the anchor’s shank and the mooring lines is（）.
A.0 degrees B.10 degrees C.20 degrees D.30 degrees
单项选择题 There is something wrong with our radar．All kinds of objects can’t be clearly（）within the definite range.
单项选择题 There is plenty of（）at this area.
单项选择题 There is not（）depth of water around the area centered at the lighthouse.
