单项选择题
Place names used should be those （）.
A.specified by international authorities B.specified by national authorities C.on standard map D.on the chart or Sailing Directions in use
单项选择题 Pilot ladder is （） on port side．
单项选择题 Passage through the Suez Canal is operated on a （） system．
单项选择题 On no account （）proceed without pilot in this water area．
