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
Furnishings for recreational facilities should（）include...
单项选择题Furnishings for recreational facilities should（）include a bookcase and facilities for reading,writing and,where practicable,games.
A.as a minimum B.as a maximum C.as a rule D.as a result
The velocity of the wind，its steady direction，and the a...
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（）.
A.temperature B.density C.deflection D.speed
When crossing a front,isobars tend to（）.A.change from s...
单项选择题When crossing a front,isobars tend to（）.
A.change from smooth curves within the air mass to sharp bends at the front B.change from sharp bends within the air mass to smooth curves at the front C.pass smoothly across the front with no change D.become closer together at the front and pass through in straight lines
