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單項(xiàng)選擇題

The frequency（）the safety message will be transmitted shall be included in DSC safety call.

A.which
B.on which
C.at which
D.in which

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We consider（）send a helicopter with medical facilities to the distress area.

A.it necessary
B.it is necessary
C.it necessary to
D.necessary

單項(xiàng)選擇題

Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.

A.depend on
B.depending on
C.dependent on
D.depended on

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