如何一个dll里调用另一个dll中的可导出类？

[cdwy411]

一个dll里调用另一个dll中的可导出类，出现如下错误
test.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall
Cc1::~Cc1(void)" (??1c1@@UAE@XZ)
test.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall
Cc2::~c2(void)" (??1c2@@UAE@XZ)
test.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall
Cc3::~c3(void)" (??1c3@@UAE@XZ)
test.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall
Cc4::~Cc4(void)" (??1c4@@UAE@XZ)
test.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall
Cc5::~Cc5(void)" (??1Cc5@@UAE@XZ)
ReleaseUMinDependency/test.dll : fatal error LNK1120: 28 unresolved externals