問題詳情

19. ________ is a pump or other machine for reducing volume and increasing pressure of gases inorder to condense the gases, drive pneumatically powered machinery, etc.
(A) Comminuter.
(B) Compressor.
(C) Agitator.
(D) Calorifier.

參考答案

答案:B
難度:簡單0.847682
統計:A(6),B(128),C(11),D(6),E(0)

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