正确答案: B
change the lube oil more frequently than normal
题目:When using a fuel with a higher than normal sulfur content in an auxiliary four stroke diesel engine, you may
解析:B
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举一反三的答案和解析:
[单选题]金属塑性变形后,其性能发生的变化是( )。
加工硬化
[单选题]泵排出压力pd=0.55MPa,吸入压力ps=-0.05MPa,流量Q=60m3/h,总效率η=80%,其轴功率为( )。
12.5kW