The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure （）.

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

[单选题]The cast iron（）for the cross-head are attached to the top section and seal off the crankcase.A . cylinder coverB . cross-head shoesC . guide-waysD . scavenging boxe

[单选题]9． —How much are these white shoes?—_________．A．It's 10 yuanB．It's 10 yuansC．They're 10 yuanD．They're 10 yuans

[名词解释] 鞋（shoes）

[单选题]The ____________ shoes were covered with mud, so I asked them to take them off before they got into __________ car.A． girl’s; Tom’sB． girls’; Toms’C． girls’; Tom’sD． girl’s; Toms’

[单选题]Additives （） protective layers on metal surfaces guarding them against corrosion.A . damageB . formC . dissolveD . contaminate

[单选题]The main bearing metal is a lining （）.A . inside the bearingB . outside the bearingC . covering the crankshaftD . none of the above

[单选题]28． The shoes are________A．￥10B．whiteC．redD．A and B

[单选题]The metal sheet used to imitate thunder must be________．A．tightly fastened on all sidesB．lying flatC．both A and BD．neither A nor B

[多选题] 通常MMC（metal matrix composite）（）A .采用高熔点、重金属作为基体。B .要比基体金属或合金的塑性与韧性差。C .要比基体金属或合金的工作温度高。D .要比基体金属或合金的弹性模量低。