單項(xiàng)選擇題The broadcast will normally be made on the two listed frequencies simultaneously except during transmitter maintenance periods when the broadcast will be made on the two frequencies（）.

A.at the same time
B.exclusively
C.within the same period
D.consecutively


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1.單項(xiàng)選擇題THE ANCHOR WAS HEAVED AWEIGH means（）.

A.The anchor was weighted
B.The anchor was let go
C.The anchor was lost
D.The anchor was clear of the bottom

2.單項(xiàng)選擇題The abbreviation RYC in a marine cable generally stands for（）.

A.referring to your crew
B.reference for your captain
C.return to your cabin
D.received your cable

3.單項(xiàng)選擇題The abbreviation L.W.R.P. on the navigation maps means（）.

A.low water reference plane
B.low winter runoff point
C.least water river plane
D.land wall reference point

4.單項(xiàng)選擇題SINGLE UP FORWARD TO HEAD LINE AND SPRING means（）.

A.let go all the lines forward including head line and spring
B.let go the head line and spring only
C.let go all the lines except a head line and a spring
D.let go the head line and spring including all the lines