40. Why had the previous ocean wave energy conversion efforts failed?
(A) Because they all relied on buoys.
(B) Because they were vulnerable to corrosion.
(C) Because they were not modified for marine use.
(D) Because they were not tethered to the sea floor.
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(B) Because they we...
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40. 為什麼之前的海浪能轉換努力失敗了...
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