Which TWO materials can be used as a substratum? A．oxygen-rich solution

游客2024-01-07 9

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 [br]

选项

答案 C

解析

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【31】[br]Trucksleavethematerialsonthe______.[originaltext]Presenter: