“Friction”和“Wear”分别是（）

1、Excessive piston ring wear in a diesel

Excessive piston ring wear in a diesel engine will cause（）Ahigh lube oil viscosityBincreased lube oil consumptionClow lube oil temperaturesDhigh firing pressure

2、摩擦成本法（Friction cost approach

摩擦成本法（Frictioncostapproach）

3、Neglecting friction，you desire to lift

Neglecting friction，you desire to lift a 300 kgs weight with a stress on the hauling part of 100 kgs.Which of the following tackles would you use（）.AGun tackleBLuff tackleCTwo-fold tackleDDouble-luff tackle

4、Brides usually wear white wedding dres

Brides usually wear white wedding dresses，because white______ purity．Astands forBstands outCstands upDstands by

5、If you wear extra clothing when enteri

If you wear extra clothing when entering the water after abandoning ship it will（）.Aweigh you downBpreserve body heatCreduce your body heatDmake it more difficult to breathe

6、To absorb the wear resulting from impe

To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.Alantern ringsBbearingsCeasing volutesDwearing ring