单项选择题

下列关于变速器的保养，正确的是(   ) A.
应定期使用汽油对内部进行清洗 B.
应时常检查齿轮油油量 C.
应定期更换档位齿轮 D.
应定期更换轴承

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The word 'indispensable' in the first line means ______.A.impossibleB.essentialC.advisableD.available
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