制动防抱死装置系统(ABS)在什么情况下,可以最大限度发挥制动器效能
A.间歇制动
B.持续制动
C.缓踏制动踏板
D.紧急制动
参考答案:D
We first met on a train in 2000.We both felt immediately that we _____ each other for years.
A.knew
B.have known
C.had known
D.know
CVP(中心静脉压)正常值为()
A.5~12cmH2O
B.4~5cmH2O
C.12~15cmH2O
D.20~30cmH2O
E.15~20cmH2O