FST液控液型井口控制柜高低压限压阀的先导压力泄压方式为（）。
A.泄放回油箱
B.高低压限压阀就地排放
C.泄放至压力容器
D.泄放至缓冲灌
参考答案：B
20. His parents were teachers in that school, _______ lost their lives in order to save
their students in the earthquake.
A．none of them
B．both of them
C．none of whom
D．both of whom
出口非配额限制系指经国家各主管部门签发非配额限制证明的方式来实现各类限制出口的措施。
