单项选择题
Admiralty Notices to Mariners are published （）.
A.every day B.every week C.every month D.every year
单项选择题 A storm is forecast for the area where your vessel is moored. For its safety you should put （）.
单项选择题 A steep barometric gradient indicates （）.
单项选择题 A stand-on vessel in a crossing situation is allowed to take action when （）.
