单项选择题
A.Radio checks and time checks
B.Inter-vessel safety and search and rescue
C.Working with helicopters
D.Radio direction finding
单项选择题 The term MODERATE SPEED was previously interpreted as meaning a speed which would enable a vessel（）within half the range of visibility.
单项选择题 The term BOLLARD PULL refers to a towing vessel’s（）.
单项选择题 The tension on an anchor cable increases so that the angle of the catenary to the seabed at the anchor reaches 10°. How will this affect the anchor in sandy soil?（）