单项选择题
Some of these shoals have been disproved and are not charted. Nevertheless mariners should （）with particular caution in this area.
A.go B.proceed C.move D.remove
单项选择题 Safe speed is defined as that speed where（）.
单项选择题 RYC8/TKS PLSPROCEED PEAKIS MEET/PLT SHIFT W/ANCH FOR/QTINE THEN/TO E/ANCH FOR/SUPPLY. This telex indicates that（）.
单项选择题 Risk of collision exists when an approaching vessel has a(n)（）.
