单项选择题

Modern engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.

A.are made of
B.are made from
C.make use of
D.are used to

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单项选择题

A.the clearance of the main bearing
B.the diameter of main bearing
C.the hardness of main bearing
D.the tolerance of main bearing

单项选择题

A.the clearance of the main bearing
B.the play of the miler bearing
C.the gap of the main bearing
D.the tolerance of the main bearing

单项选择题

A.of crosshead type
B.of trunk piston type
C.of low speed type
D.all the above