单项选择题
While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.
A.A decreasing reading on loran pair 9960-X B.The bearing of Wolf Trap Light changing to the right C.Increasing soundings D.The bearing of Wolf Trap Light changing to the left
单项选择题 Which statement concerning GPS is TRUE（）.
单项选择题 Which one of the followings does not limit the effective range of radar（）.
单项选择题 Which of the following statements is TRUE regarding crane operations（）.
