具有黏附于玻璃、塑料表面特性的细胞是（）.
A.巨噬细胞
B.肥大细胞
C.中性粒细胞
D.NK细胞
E.红细胞
参考答案：A
立面水磨石一般将______混合使用，或______单独使用。使用前将石粒冲洗干净并晾干。
—We don't know ______.
—It is said that he was born in America. [ ]
A. what is he
B. if he lives here
C. where he comes from
D. which country is he from
