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【多选题】
关于检测汽油电控发动燃油系统的压力，以下说法正确的是( )A.
供油压力是指发动机在怠速运行时燃油系统中的实际工作油压，电控燃油喷射无回油系统油压一般在300Kpa以上
B.
调节压力是讨论的有回油系统的燃油压力的情况
C.
测试燃油系统的燃油压力时，必须释放残余压力后在进行测量
D.
残余压力是指测量燃油系统油压后，关闭发动机20min后测得的系统油压，通常较低甚至为零
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