15. 當發現雙缸四作用往復泵缺少一泵閥時，下列何種閥不裝對流量影響較小? (A) 主要安全閥 (B) 排出閥 (C) 與帶活塞桿的泵缸空間連通的吸入閥 (D) 與帶活塞桿的泵缸空間聯通的出口閥

39. 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. This means what？ (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

15. 當發現雙缸四作用往復泵缺少一泵閥時，下列何種閥不裝對流量影響較小?
(A) 主要安全閥
(B) 排出閥
(C) 與帶活塞桿的泵缸空間連通的吸入閥
(D) 與帶活塞桿的泵缸空間聯通的出口閥

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