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外语
Which TWO materials can be used as a substratum? A.oxygen-rich solution B.coconut fibre C.mineral wool D.rock
Which TWO materials can be used as a substratum? A.oxygen-rich solution B.coconut fibre C.mineral wool D.rock
admin
2012-01-16
110
问题
Which TWO materials can be used as a substratum?
A.oxygen-rich solution
B.coconut fibre
C.mineral wool
D.rock
E.paper fibre
选项
答案
C
解析
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