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单选题
船舶二冲程机主机运转期间，（）能减少气缸套磨损，防止产生异常磨损。 1合理选择气缸油碱值 2定期化验润滑油 3使用高黏度的气缸油 4加强滑油过滤和分离
A
1+2
B
1+3
C
1+2+3
D
1+2+3+4
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