Forwhatpurposearethedivingpipesused?
A.Toabsorbheatfromthesun.
B.Tostoreheatforfutureuse.
C.Toturnsolarenergyintoheatenergy.
D.Tocarryheatd ownbelowthesurface.
正确答案:D
Forwhatpurposearethedivingpipesused?
A.Toabsorbheatfromthesun.
B.Tostoreheatforfutureuse.
C.Toturnsolarenergyintoheatenergy.
D.Tocarryheatd ownbelowthesurface.
正确答案:D