简单的物理题（英文）·

Four bars, all exactly the same size, are placed with one end in boiling water.The times taken for the temperature of the other end to increase by 2 degrees are measured

material of bar time for 2degrees rise/s
--------------- ------------------------
aluminium 10
copper 5
cork 800
foam 1200

To make a large metal tank with the least heat loss,which materials shoud be used for the tank and its insulation?
-----------------------
tank insulation
-----------------------
A aluminium cork
B aluminium foam
C copper cork
D copper foam 说明原因，谢谢。
一楼 晕~~~

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