题目内容

The main purpose of the piston oil scraper rings is to （）.

A. seal the space between the piston and the liner
B. reduce the amount of lube oil burned in the combustion chamber
C. transmit heat from the piston to the cylinder liner
D. damp out fluctuations of the piston side thrust

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A. 查看传感器应无损伤、变形
B. 温度计需经校验合格后安装。检查温度设置准确，连接一次电缆应完好
C. 可直接将站用变测温传感器安装在箱盖上的测温座中
D. 金属细管应按照弯曲半径大于40mm盘好妥善固定

A. 调度命令
B. 路票
C. 绿色许可证
D. 车站值班员的命令