A ship can request completion of a () when the ship is at a higher security level than the port facility or another ship it is interfacing with.
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
为了保证船舶航行安全,首先要确定船舶的航向与位置。船舶定位方法按照参照目标可分为( )。
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