单项选择题
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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单项选择题
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 -
单项选择题
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) -
单项选择题
The work fuel does in each working cycle can be obtained by taking the （）.
A.precautions
B.rpm
C.indicator cards
D.B and C
