急性食管炎时黏膜鳞状上皮和固有膜内主要的浸润细胞是:()
A.淋巴细胞
B.嗜酸性白细胞
C.中性白细胞
D. 嗜碱性白细胞
参考答案:C
It is worthwhile considering what makes “convenience” foods so popular, and____ better ones of your own.
A.introduces
B.to introduce
C.introducing
D.introduced
试运行前应做那些准备工作?