单项选择题
A.rising warm air B.proximity to a low pressure area C.inward spiraling circulation D.clear dry weather
()during the voyage any case or suspected case of plagu...
单项选择题()during the voyage any case or suspected case of plague,cholera,yellow fever,smallpox,typhus or relapsing fever?
A.Has there been B.Have there been C.Has there D.Have there
()day,pilot flag should be displayed from main mast.A.F...
单项选择题()day,pilot flag should be displayed from main mast.
A.From B.By C.on D.With
()any sick person on board now apart from the above-men...
单项选择题()any sick person on board now apart from the above-mentioned cases?
A.Have B.Has C.Is there D.Are there