9. Immediately after completing the study of astronomy, he developed some ____ instrumentation to detect radiation.
(A)crude
(B)exigent
(C)incessant
(D)unilateral
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統計: A(38), B(30), C(16), D(19), E(0) #3445907
統計: A(38), B(30), C(16), D(19), E(0) #3445907