单选题
A diesel engine should not be operated at low loads for long periods of time because（）
发布日期：2021-03-22
heavy carbon deposits will buildup on the valves and in the exhaust
fuel dilution is increased at low load
exhaust valves may be damaged
all of the above
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软化血管的何首乌粥？
TPDS踏面损伤一级报警的标准是（）。
车站不得将无标记货物交给（）取送或带送，不得自行用无标记货物（）自站责任的丢失货物。
水肿病一般无（ ）。
气体物质的燃烧方式主要包括：（）
120型控制阀具有紧急制动缸压力两段上升的性能。
最低工作温度低于（）℃的司机室，应设安全可靠的采暧设备，采用闭式司机室。
沙县小吃是（）风味。
下列不属于促胰液素作用的是（ ）。
闸调器拉杆在制动时伸长后不能复原的原因是什么？如何处理？
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