单项选择题
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
点击查看答案&解析
相关考题
-
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
D.is painted with red and white vertical stripes -
单项选择题
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 -
单项选择题
A gnomonic projection is based on a(n)（）.
A.plane tangent at one point
B.cylinder tangent at the equator
C.cone tangent at one parallel
D.infinite series of cones tangent at selected parallels
