单项选择题
Please light the pilot lamp.()up and () down. ()
A. White;red B. Red; white C. Red; green D. Green ;red
单项选择题 If we have a pilot on board , we should take down () and hoist () .()
单项选择题 When the anchor reaches the bottom ,hoist the anchor ()by day.
单项选择题 Letter “G” shows that“ ()”.