菲林片（Film）
参考答案：
是通过照排机转移印刷品电子文件的透明胶片，用于印刷晒版。
It is clear to us that the 2012 Olympic Games _____ in London will once more draw people's attention in the
world to them. [ ]
A. having been held
B. to hold
C. to be held
D. held
下列几种抗凝剂，何者最适宜用于血细胞计数（）
A.乙二胺四乙酸二钾（EDTA-K2）
B.枸橼酸钠
C.草酸钠
D.草酸钾
E.肝素
