单项选择题

All of the following vessels are “restricted in their ability to maneuver” EXCEPT a vessel （）.

A.laying a pipeline
B.dredging
C.mineclearing
D.not under command

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All of the following information concerning lighted aids to navigation may be read directly from the Light List EXCEPT the（）.

A.location
B.height of light above water
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All of the following are part of the fire triangle EXCEPT（）.

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All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.

A.every station in one chain to transmit at the same time
B.each station to transmit without reference to another station
C.on-line transmission of single-line transmitters at the same time
D.each station to only depend on the master for synchronization and signal ratio