血淀粉酶正常的急腹症患者可排除急性胰腺炎。
参考答案：错
用所给词的适当形式填空。
1. I think the light bulb is the most useful _____ (invent).
2. Thomas Edison was a great _____ (invent).
3. The cup is used for _____ (warm) the cold wine.
4. The length of the rope is _____ (adjust).
纤维双折射等于零时，表示该纤维在光学性质方面具有（）。
