单项选择题
What occurs when rising air cools the dew point?（）
A.advection fog forms B.humidity decrease C.wind increase D.Cloud form
单项选择题 （）means an observed situation where objective evidence indicates the non-fulfillment of a specified requirement.
单项选择题 （）water is the water in the hold to keep the ship’s stability.
单项选择题 Odorous cargoes are those that（）.
