87. X in limited amount is present in soil and is essential for plants nutrients but if present in high
concentration can be harmful both for plants, animals and aquatic organisms. What is X?
(A) Hydrogen sulphide
(B) Carbon dioxide
(C) Ammonia
(D) Water
(E) All of above
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氨存在於土壤中的量有限，是植物營養所必需...
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