The cast iron（）for the cross-head are attached to the top section and seal off the crankcase.

[单选题]The cross-head shoes are white metal （）.A . liningB . linedC . madeD . i

[单选题]The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure （）.A . an adequate supply of lube oilB . an adequate supply of fuel oilC . an adequate supply of turbine oilD . an adequate supply of

[单选题]The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.A . the connecting rodB . the cross-headC . the piston rodD . the air box

[单选题]Cast iron carrier rings, （） machined grooves, are provided for all the pistons.A . caulked intoB . caulking intoC . pressed intoD . screwed into

A number of cylinder liners are enclosed in one cast iron casing to form a( ).A

The period _________ people learned to melt iron is called the Iron Age.A. whenB

[名词解释] CAST

[单选题]Which is( )， iron or copper？A.heavierB.heavyC.more heavyD.much heavy

[名词解释] 管型（cast）

[问答题] 单交（single cross）