现有一半径为6cm的半圆形纸片，用它所围成的圆锥侧面其底面半径是______cm．
2πr=180π×6180，
解得r=3cm．
—_____ you _____ the film Gongfu Panda Ⅱ?
—Not yet. I'll see it this Sunday. [ ]
A. Did, see
B. Do, see
C. Have, seen
简述精液（斑）的实验室检验的初步试验。
