对家禽维生素D2的活性仅为D3的().A、1/2—1/3B、1/20—1/30C、10%D、20%
对家禽维生素D2的活性仅为D3的().
- A、1/2—1/3
- B、1/20—1/30
- C、10%
- D、20%
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