对海水的淡化处理是模拟生物膜的[ ]

A．物质运输功能

B．选择透过功能

C．保护功能

D．信息传递功能

In small angle stability，the metacentric height（）.

A.is found in the hydrostatic tables for a level vessel

B.multiplied by the displacement yields the righting moment

C.is always positive

D.is calculated by subtracting KG from KM