决定晶体结构和性能最本质的因素是（）.
A.原子间的结合能
B.原子间的距离
C.原子的大小
参考答案：A
The river near our village is about ____ long. [ ]
A. three-hundreds-metres
B. three-hundred-metre
C. three-hundred-metres
D. three hundred metres
制氢设备停止运行时，制氢室内可以抽烟。
