单项选择题

Ships at sea are in urgent need of MSI because they are（）various kinds of danger.

A.subject for
B.liable to
C.easy to meet
D.always encounter

相关考题

In the GMDSS, MSI broadcasts will be made on two dedica...

单项选择题In the GMDSS, MSI broadcasts will be made on two dedicated systems:（）and（）.

A.NBDP/VHF radio
B.Inmarsat safetyNet/NAVTEX
C.Safety service / Inmarsat-A
D.Long range / short range

International SafetyNet and Navtex Services promulgate ...

单项选择题International SafetyNet and Navtex Services promulgate MSI by means of（）.

A.FEC and ARQ
B.satellite and terrestrial communications
C.radio and telex
D.NBDP

With the help of modern technology, ships are able to r...

单项选择题With the help of modern technology, ships are able to receive automated broadcast of safety messages（）.

A.by day or at night
B.almost round the clock
C.somewhat and sometime
D.from sunrise to sunset