For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）

A.insufficient fuel supply due to fuel pump valves sticking or leaking
B.excessive mechanical clearance between the piston crown and cylinder head
C.excessively worn fuel pump plunger
D.excessive exhaust back pressure

A.detecting faulty combustion in individual cylinders
B.adjusting fuel racks to maintain equal loading between cylinders
C.adjusting the load limit setting of the governor at idle conditions
D.calculating engine horsepower

A.tension load twice each crankshaft revolution
B.compression load during power and compression strokes
C.inertia load once every four crankshaft revolutions
D.bending loads at bottom and top dead center