She was so________in her job that she didn’t hear someone knocking at the door.

A．absorbed

B．attracted

C．drawn

D．concentrated

当减压转油线出现大泄漏时应采取（）措施。

A.减压炉迅速切断进料，单歼常压

B.减压塔破真空

C.减压塔内通人蒸汽，逐步恢复正压

D.降低塔内温度