单项选择题
A.are exceptionally dusty and leave a residue
B.are liquid but are in containers
C.are susceptible to damage by tainting
D.give off fumes that may damage other cargoes
单项选择题 Furnishings for recreational facilities should（）include a bookcase and facilities for reading,writing and,where practicable,games.
单项选择题 The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.
单项选择题 When crossing a front,isobars tend to（）.