單項(xiàng)選擇題A precaution you should take before bunkering is to （） .

A.plug the vents
B.plug the sounding pipes
C.plug the scuppers
D.close the lids on the vents


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1.單項(xiàng)選擇題A position that is obtained by using two or more intersecting lines of position taken at nearly the same time，is a(n) （）.

A.fix
B.running fix
C.estimated position
D.dead-reckoning position

2.單項(xiàng)選擇題A position that is obtained by applying estimated current and wind to your vessel’s course and speed is a(n) （）.

A.estimated position
B.dead reckoning position
C.fix
D.None of the above

3.單項(xiàng)選擇題A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n) （）.

A.dead-reckoning position
B.running fix
C.estimated position
D.fix

4.單項(xiàng)選擇題A position obtained by applying ONLY your vessel’s course and speed to a known position is a （）.

A.fix
B.dead-reckoning position
C.running fix
D.probable position

5.單項(xiàng)選擇題A polyconic projection is based on a （）.

A.plane tangent at one point
B.cylinder tangent at one parallel
C.cone tangent at one parallel
D.series of cones tangent at selected parallels