______ the new medicine for a year and we'll see how well it works. [ ]

A. Try out

B. Make out

C. Give out

D. Pick out

大体积混凝土浇筑方案中哪一种浇筑方案混凝土浇筑强度最小（）

A.斜面分层

B.分段分层

C.全面分层

D.泵送