混凝土拌和料中加入减水剂，可提高混凝土的和易性。（）
参考答案：对
简述阿斯匹林引起胃道反应的机理与防治。
I don't have _____ bread. Please give _____ to me. [ ]
A. some; any
B. some; some
C. any; any
D. any; some
