The crown is fairly thick with the cylindrical parts （） to a thinner section...

A、not taper what so ever B、the skirt being tapered and smaller than the crown C、the skirt being tapered and larger than the crown D、the crown being tapered and smaller than the skirt

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第7题

[单选题] Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.

A、the cylinder cover B、the piston rings C、the piston crown D、the piston skirt

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第8题

[单选题] The length of chain between the anchor and the end of the pendant line is called the（）.

A、pigtail chain B、thrash chain C、crown chain D、wear chain

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第9题

[单选题] The piston crown employs the usual jet-shaker principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution（）

A、water cooling B、oil cooling C、air cooling D、combined cooling

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The crown is fairly thick with the cylindrical parts （） to a thinner section.

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