下列发明创造中,不可能授予专利权的是()。
A.一种新的食品添加剂
B.一种新的血压测量仪
C.一种新的毒品吸食工具
D.一种新的印刷技术
参考答案:C
I walked up to the top of the hill with my friends, _____ we enjoyed a splendid view of the lake. [ ]
A. which
B. where
C. who
D. that
急性放射病主要分为哪几种临床类型?