It is believed that high achievers are ambitious, hard-working, and work toward personal standards of

excellence _____ material rewards. [ ]

A. other than

B. or rather

C. rather than

D. or else

液化气泵串联式机械密封在第一级密封故障的情况下，第二级密封可独立承担轴封的作用。此时介质不会泄漏入大气，而是进入（），达到一定程度时会引起系统压力的升高和储罐液位的变化。

A、冷却系统

B、润滑系统

C、隔离液系统

D、循环系统