Fireproofing performance has reached national B-level standard.
防火性能防火等级达到国家B级标准。
B: I suggest you go up to our next higher price level.
B：我建议您采用我们价格再高一级的货。
Raise arms up to shoulder level together in front of the body (see Photo B).
双臂一起向身体前方上举至肩膀水平（见图B）。
Changes in lake level must be due to the net difference [between a and b].
湖水含量的变化一定是由于A和B之间的净差值。
Changes in lake level must be due to the net difference [between a and b].
湖水含量的变化一定是由于A和B之间的净差值。
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