听力原文:M: Good morning. I'm Jack, Jack Brown. My father asked me to come over and see you about a vacation job. W: Oh, come in, Jack, I haven't seen you for ages. I hear you're at the university now. Q: What does Jack want? (16)
【简答题】在燃油供油单元FCM的自动控制系统中,开始对轻油(DO)进行温度定值控制的条件是将控制方式选择开关由A. 切除(OFF)位置打到轻油(DO)位置 B. 重油(HFO)位置打到轻油(DO)位置 C. 切除(OFF)位置打到重油(HFO)位置 D. 切除(OFF)位置打到轻油(DO)位置,并且程序升温达到轻油(DO)定值控制设定温度以下3 ºÇ之内