After arrived at the port, if it is necessary to lift the piston out and inspect the M-E temporarily, the chief engineer should report the situation to the(), and the operation could be performed only after having the approvement of relevant department.
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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