硫酸分解法所得粗酚质量有哪些要求？
参考答案：
含酚量不低于83%，含水不大于10%（12%），含硫酸钠不大于0.3%，反应：中性。
The doctor recommended that you ___ swim after eating a large meal. [ ]
A. wouldn't
B. couldn't
C. needn't
D. shouldn't
糠心
