单项选择题
A light having characteristics which include color variations is defined as（）.
A.switching
B.alternating
C.oscillating
D.fluctuating
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A light characteristic of composite group flashing indicates that there is a(n)（）.
A.sharp turn in the channel
B.narrowing in the channel at that point
C.junction in the channel
D.obstruction that must be left to port -
单项选择题
A lateral system buoy displaying a quick light（）.
A.should be passed close aboard on either side
B.indicates that special caution is required
C.is used at a channel bifurcation or junction
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A great circle track provides the maximum saving in distance on（）.
A.easterly courses in high latitudes
B.southerly courses in high latitudes
C.westerly courses in low latitudes
D.easterly courses in low latitudes that cross the equator
