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单选题
1693. 松开减压器[2]上的转动螺母[10]和大气压力过滤器组件[4]两端的旁通阀[8]。
A
Loosen the cotter nuts [10] on reducer [2] and bypass valve [8] on each end of air pressure filter assembly [4].
B
Loosen the swivel nuts [10] on reducer [2] and bypass valve [8] on each end of air pressure filter assembly [4].
C
Loosen the cross nuts [10] or reducer [2] and standby valve [8] on each end of air pressure filter assembly [4].
答案解析
正确答案：B
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