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【单选题】
中华人民共和国于1955年开始实行义务兵役制，建立了定期的征兵、退伍制度。( )年，中国人民解放军首次进行义务兵退伍工作。A.
1955
B.
1958
C.
1960
D.
1962
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catch
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【单选题】______ conveys a signal of desired rudder angle from the bridge and activates the power unit and transmission system unit the desired angle is reached.
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The control equipment
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transmitter
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hydraulic ram
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