單項選擇題() is fully floating in both connecting rod small end and the piston skirt.

A.The piston rod
B.The cross head pin
C.The gudgeon pin
D.The crank-pin


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2.單項選擇題() is a source of power by which the diesel engine may operate.

A.Water energy
B.Electrical energy
C.Chemical energy
D.Heat energy

3.單項選擇題() is a precaution which contributes to avoiding trouble under normal operating conditions.

A.Constant inspection
B.Keeping constant load
C.Remaining constant temperature
D.varying speed

4.單項選擇題() are mounted on and bolted to the bed-plate cross girders.

A.The crankshaft
B.The crankcase
C.The guide-ways
D.The frames