單項(xiàng)選擇題

The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.

A.sometimes
B.all times
C.never
D.partly

你可能感興趣的試題

單項(xiàng)選擇題

The identification character of each Navtex station is regarded as（）to the messages.

A.the only preamble
B.a part of the preamble
C.the closing
D.the suspension

單項(xiàng)選擇題

Exchange of answerbacks act s a confirmation that the messages（）at the destination.

A.have received
B.have been received
C.are received
D.are being received