单项选择题
In admiralty sailing directions, stripes is the word used to indicate（）marking.
A.horizontal B.vertical C.diagonal D.vertical or diagonal
单项选择题 In anchoring orders, up and down means（）.
单项选择题 In anchoring orders, walk back the chain means（）.
单项选择题 In reading a weather map, closely spaced pressure gradient lines would indicate（）.
