商品的化学性能一般是指商品的（）。
A、化学反应
B、化学稳定性
C、化学变化
D、化学功能
参考答案：B
—How much do you know about the 3D film technology?
—A little. Not until ______ the hot movie Avatar ______ some about it. [ ]
A. did I see; did I begin to learn
B. I saw; I began to learn
C. I saw; did I begin to learn
D. did I see; I began to learn
“六会”是参谋业务的基本功。请问“六会”的具体内容是什么？这是哪一位元帅提出的？
