15.What is the average concentration range of dissolved silicate in north pacific deep waters?
(A) 20~40 nM,
(B) 40~80 μM,
(C) 250~300 μM,
(D) 150~160 μM,
(E) 190~200 μM

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統計： A(0), B(0), C(1), D(1), E(0) #2788463