单项选择题
（）objects are those which stand out clearly from the background or other objects and are easily identifiable from a few miles offshore in normal visibility．
A.Conspicuous B.Permanent C.Preliminary D.Temporary
单项选择题 （）day，pilot flag should be displayed from main mast．
单项选择题 The heights and soundings of Admiralty chart are expressed（）in Fathoms（）in Meters．
单项选择题 （）is not contained in the NM Weekly.
