“Friction”和“Wear”分别是（）

[单选题]“Friction”和“Wear”分别是（）A.摩擦和磨损；B.磨损和摩擦

[单选题]Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.A . acidity of the oilB . pour point of the oilC . flash point of the oilD . viscosity of the oil

[单选题]e和π分别是（）数.A . 代数数，超越数B . 超越数，代数数C . 代数数，代数数D . 超越数，超越数

[单选题]Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to （）.A . react with insufficient speed droopB . fail to react to small speed changesC . have excessive sensitivity to small speed

[单选题]C．They wear the latest fashions with the most up-to-date accessorise(配饰)。Yet these are ginrls in their teens or twenties but women in their sixties and seventies.A gengration which would once only wear old-fashioned clothes is now faouring the same h

[填空题] IPPC和SPS分别是指（）和（）。

[主观题]摩擦成本法（Frictioncostapproach）

[填空题] ping和ipconfig的作用分别是（）和（）。

[填空题] 初霜冻和终霜冻分别是（）和（）。

[填空题] 气管和食管的上皮分别是（）和（）。