下列属于免疫系统的是[ ]
A.骨髓、胸腺
B.淋巴细胞、吞噬细胞
C.扁桃体、淋巴结
D.抗体、淋巴因子
ABCD
用所给单词的反义词完成句子。
1. Look at the palace. It's eight hundred years old. It's very ________. (young)
2. Come and look _________ the window. (outside)
3. Please _________ beside the tree. (stand)
4. Look at the baby, he becomes __________. (loud)
焦炭塔油气温度高低可通过()量来调节。