To develop maximum anchor holding power，the optimum angle between the anchor’s shank and the mooring lines is（）.

There is something wrong with our radar．All kinds of ob...

单项选择题There is something wrong with our radar．All kinds of objects can’t be clearly（）within the definite range.

There is plenty of（）at this area.A.a roomB.roomC.roomsD...

单项选择题There is plenty of（）at this area.

There is not（）depth of water around the area centered a...

单项选择题There is not（）depth of water around the area centered at the lighthouse.