1/5单选题
难度：
1.
在
，
，-0.7xy+y3，
，
，
中，分式有( )个
| A | 2 |
| B | 3 |
| C | 4 |
| D | 5 |
正确答案：Qg==
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
有意义，则x的取值范围是( ) 
的值为0，则x的值是() 
的值是( ) 
时，值为零
时，值为零