A. 正确 B. 错误
A. Watching the compass bearing of an approaching vessel B. Systematic observation of objects detected by radar C. Long-range radar scanning D. All of the above
A. 中性粒细胞 B. 嗜酸性粒细胞 C. 嗜碱性粒细胞 D. 淋巴细胞 E. 单核细胞
A. 小肠 B. 大肠 C. 胃 D. 脾