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单项选择题

 When did RMS Carpathia arrive on the scene of Titanic’s sinking?

A．  About an hour and a half after the sinking.
B．  About one day after the sinking.
C．  About several minutes after the sinking.
D．  About half day after the sinking.

判断题

优化MBR膜组件结构，提高膜组件使用寿命是促进MBR发展和应用的一个重要因素。