单项选择题
A.horizontal B.vertical C.diagonal D.vertical or diagonal
In anchoring orders, up and down means（）.A.the chain is...
单项选择题In anchoring orders, up and down means（）.
A.the chain is not upright B.the chain is tight C.the chain is upright D.the chain is slack
In anchoring orders, walk back the chain means（）.A.pay ...
单项选择题In anchoring orders, walk back the chain means（）.
A.pay away the chain B.take in the chain C.check up the chain D.take a strain on the chain
In reading a weather map, closely spaced pressure gradi...
单项选择题In reading a weather map, closely spaced pressure gradient lines would indicate（）.
A.high winds B.high overcast clouds C.calm or light winds D.fog or steady rain
