The development of （） has kept pace with the increasing demands made by the steady rise in power produced by modem marine diesels.

A.the connecting rod
B.large end bearing
C.the main bearing
D.the design

A.the block bearing
B.the camshaft bearing
C.the connecting rod small end bearing
D.the connecting rod large end bearing

A.screwed
B.welded
C.fastened
D.rotated