设X、Y、Z为逻辑变量，当且仅当X和Y同时为1时，Z为0，其他情况下Z为1，则对应的逻辑表达式为（ ）。
- A.Z=X·Y
- B.X+Y
- C.<img src='http://tp.mxqe.com/data/718/17975804_0.png' alt='中级软件评测师,历年真题,2019年下半年（上午）《软件评测师》真题' title='中级软件评测师,历年真题,2019年下半年（上午）《软件评测师》真题'>
- D.<img src='http://tp.mxqe.com/data/718/17975804_0_1.png' alt='中级软件评测师,历年真题,2019年下半年（上午）《软件评测师》真题' title='中级软件评测师,历年真题,2019年下半年（上午）《软件评测师》真题'>
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