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单选题
齿轮箱部分包括齿轮、轴、密封件、油泵、冷却器等。
A
Gearbox section includes items such as gears, shafts, seals, oil pumps, coolers, etc.
B
Items like gears, cranks, seals, oil tanks and coolers all belong to gearbox section.
C
Gearbox is composed of gears, shafts, seals, gas pumps, coolers, etc.
答案解析
正确答案：A
