A . main bearings
B . connecting rod bearings
C . piston pin bushings
D . All of the above
[单选题]The ports are drilled in the liners at an angle of approx 20℃ the result being that () is given a rotary movement.A . the scavenging airB . the exhaust gasesC . the mixed airD . the spray oil
[单选题]Crankshafts of medium speed engines are () from a single piece of steel.A . unusually solid weldedB . never be solid forgedC . almost invariably solid forgedD . almost invariably be welded
[单选题]Directions: In this section, there are four passages followed by questions
[单选题]Directions: In this section, there are four passages followed by questions
[单选题]Directions: In this section, there are four passages followed by questions
[单选题]Directions: In this section, there are four passages followed by questions
[单选题]Directions: In this section, there are four passages followed by questions
[单选题]Directions:In this section, there are four passages followed by questions o
[单选题]Directions:In this section, there are four passages followed by questions o
[单选题]Directions:In this section, there are four passages followed by questions o