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單項(xiàng)選擇題

There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.

A.recirculating
B.total loss
C.cooling
D.refrigeration

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單項(xiàng)選擇題

There is （） in any water cooling system for a diesel engine allowing for expansion and water make-up in the system as well as air vent and chemicals addition.

A.a setting tank
B.a service tank
C.a head tank
D.an expansion joint

單項(xiàng)選擇題

The working cycle of a four-stroke diesel engine consists of four events:（）
(1) compression
(2) expansion
(3) exhaust
(4) suctionThe correct sequence is

A.(4)-(2)-(3)-(1)
B.(4)-(3)-(1)-(2)
C.(4)-(3)-(2)-(1)
D.(4)-(1)-(2)-(3)