康明斯ISBe发动机减速缓慢的原因有()。
A、油门踏板回位慢
B、油门踏板传感器发生故障
C、电子控制模块(ECM)故障
D、喷油器电磁阀电路发生故障
参考答案:A, B, C, D
Mr Black has two sons, one of ________working as a doctor.
A.them
B.who
C.whom
D.whose
A.5A
B.5A
C.5/2A
D./2A