About 187 passengers were reported  _____ the shipwreck which happened last month.

A．to have been survived

B．having survived

C．to have survived

D．to survive

下列关于离心泵的描述中，错误的是（）。

A、叶片的入口角对离心泵的吸入能力有直接影响

B、叶片的出口角直接影响着性能曲线的形状

C、离心泵的性能曲线不会随着转速的改变而改变

D、多级离心泵一般都设有导叶，用于汇集液体，引向下一级叶轮或压出室