A:However
B:On the other hand
C:At the same time
D:On the contrary
为测定实验室一瓶放置已久的烧碱中NaOH含量,取50g的烧碱样品,溶于一定量的水得到200g溶液;再加入200g稀盐酸(足量)充分搅拌到不再放出气泡为止,称量溶液为395. 6g。计算:
65+68=____