结核病主要的免疫保护机制是__________,参与此过程的细胞主要为__________和__________。
参考答案:细胞免疫、 巨噬细胞、 T淋巴细胞
请用所给单词的正确形式填空。
1. I __________ to the library on Sundays. I __________ to the library yesterday. (go)
2. She often __________ Miss Zhang. She __________ Mr. Wood yesterday. (see)
3. Jenny __________ her homework every day, but she didn't __________ her homework yesterday. (do)
4. Danny __________ __________ checkers now. Yesterday he __________ with a ball. (play)
不属于进度计划的表示方法的是()。
A.横道图
B.里程碑法
C.S形曲线比较法
D.时标网络图