白细胞吞噬异物的过程大体包括（）与消化三个阶段。
参考答案：识别与黏附、摄入、杀灭
—___________ English classes do you have every week?
— Five.
A. How often
B. How long
C. How much
D. How many
钻孔灌注桩施工时，护筒内径宜比桩径大（）
A.100~200mm
B.200~300mm
C.200~400mm
D.300~400mm
