下列类别的物质中，不可能含有三种元素的是[ ]

A．酸

B．碱

C．盐

D．氧化物

What is MTI?（）.

A.The fioot/tons needed to trim the vessel by 1 inch

B.The foot/tons needed to trim the vessel by 1 foot

C.The moments needed to trim the vessel by 1 centimeter

D.The amount of vessel will trim when loading 100 tons 100 feet from the tipping center