在下面的运算符重载函数的原型中，错误的是

A．Volume operator-(double,double);

B．double Volume::operator-(double);

C．Volume Volume::operator-(Volume);

D．Volume operator-(Volume,Volume);

Microsoft’s COM is a software (146) that allows applications to be built from binary software components. COM is the underlying architecture that forms the foundation for higher-level software services, like those provided by OLE. COM defines a binary standard for function calling between components, a way for components to dynamically discover the interfaces implemented by other components, and a mechanism to identify components and their interfaces uniquely.

OLE is a compound (147) standard developed by Microsoft. OLE makes it possible to create (148) with one application and link or embed them in a second application. Embedded objects retain their original format and (149) to the application that created them. Support for OLE is built into the Windows and MacOS Operating Systems. A (150) compound document standard developed mainly by Apple and IBM is called OpenDoc.

（149）是（）

A.characteristics

B.address

C.page

D.links