【名词&注释】
相互关系(relationship)、特殊情况(special case)、防污染、明确规定(clearly stipulated)、机动船(motor vessel)、书面报告(written report)
[单选题]To reduce the weight of the reciprocating parts, pistons of high-speed engines are made considerably shorterThis results in __________.
A. less piston slap and quieter running
B. increased crankshaft bearing wear
C. slightly greater piston wear
D. decreased side pressures