A、The chromium will not wear out the piston rings
B、The chromium strengthens the liners in the way of the scavenging air ports
C、Chromium eliminates the need for oil scraper rings
D、Pores in the plating aid in maintaining the lube oil film
更多“Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）”相关的问题
A、Because they are not engaged in the distress traffic B、they will affect the transmission of the distress traffic C、The powers of these stations are very weak D、They are not in charge of search and rescue
A、A. There are some saws in my toolbox. B、B. There are some pairs of pliers in my toolbox. C、C. There are some spanners in my toolbox. D、D. There are some tools in my toolbox.
A、A.Why don‘t we go now. B、B.Why don‘t we enjoy some beer at that bar. C、C.Why didn‘t you look up the map? D、D.Why didn‘t you tell me about it earlier.
A、They are not designed for multi-access-point networks. B、They do not scale well. C、They have higher total cost of ownership than some enterprise products. D、Their upgrade paths compete directly against Cisco upgrade paths.
A、they operate between 150 and 450 rpm B、they are connected to the propeller by gearing C、their smaller size and weight D、they can be connected directly to the propeller without gearing
A、reduce wear on the valve stem B、permit the use of alloy valve seat materials C、reduce heat transfer from the valve seat D、facilitate valve removal for servicing
A、sliding the camshaft along its axis B、rotating the cam 180 C、rotating the cam followers 180 D、moving the idler sprockets in the drive chain
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