根据继电保护装置对被保护对象所承担的保护任务，可把保护分为（）
A.主保护
B.后备保护
C.辅助保护
D.失灵保护
参考答案：A, B, C
根据首字母填空。
1. We must try our best to make the Food Festival s .
2. Don't eat too many h . That will make you fat.
3. —May I i you to our Music Festival?
—I'd love to.
4. What do you think the children should p for the Christmas?
5. The school in my v has very few school supplies.
非甾体类消炎止痛药的作用机制是
A．抑制体液免疫
B．增强NK细胞活性
C．抑制B细胞
D．抑制T细胞
E．抑制前列腺素合成
