13.離心式淨油機利用高速旋轉產生離心力的澄清（分離）原理，主要藉由下列些因素分離油、水、雜質？ (A)油、水、雜質的旋轉速度不同 (B)油、水、雜質的黏度不同 (C) 油、水、雜質的密度不同 (D)油、水、雜質的離心加速度不同

30.The ignition delay associated with fuels of low ignition quality results in a late and more explosive start to the combustion period, which results in higher peak pressures and consequent rough and noisy operation. Therefore,＿＿＿＿＿＿＿ . (A)the ignition delay could increase the mean effective pressure of cycle (B) the more explosive start to the combustion period due to ignition delay could generate the higher peak pressure (C)the ignition delay associated with fuels of low ignition quality is beneficial for engine performance as it results in higher peak pressures (D)the ignition delay associated with fuels of low ignition quality could alleviate the noise generation

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