何情况下ECU控制高压燃油关断活门的打开（）
A.选择点火起动位或冷转位；
B.主电门ON位；
C.A+B。
参考答案：C
A major advantage of the NAVTEX system when compared to other systems is that（）.
A.the information can be received on an ordinary FM radio
B.warnings are printed out for reading when convenient
C.broadcasts are at scheduled times
D.a low frequency band is used for long distance transmission
下列属于竞争导向定价法的有（）.
A．随行就市定价法
B．密封投标定价法
C．主动竞争定价法
D．撇脂定价法
E．渗透定价法
