单项选择题
Please put the rush mats（）the bags.
A.arounded B.inside C.some distance above D.underneath
单项选择题 Please stand-by（）channel 12.
单项选择题 Please use these bags to make a wall in the hold and leave the（）for ballasting.
单项选择题 The check under shipowner’s organization made at the loading port is to avoid accepting cargo（）upon receipt.
