31. 拆開一號主空壓機進口閥&排出閥檢查 Dismounted suction valves & delivery valves from No.1 main air ________ for inspection.
(A) reservoir
(B) compensator
(C) condenser
(D) compressor

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統計： A(6), B(22), C(14), D(268), E(0) #1098350