用来防止紧急制动作用后容积室的压力过高,以致造成制动缸压力过高、制动力过大,引起滑行而擦伤车轮踏面的是安全阀。
参考答案：对
高血压伴脑血管疾病的患者最好选用
A．肼屈嗪 B．硝普钠 C．尼莫地平 D．可乐定 E．卡托普利
________ made his family disappointed.[ ]
A. He not being chosen
B. His not having been chosen
C. Him not being chosen
D. He was not chosen
