题型:问答题 简答题 It's cold outside. Please tell him ______ her coat. [ ]A. don't take off B. not to take off C. don't put on D. not to put on 查看答案
题型:问答题 简答题 在“食盐、葡萄糖、硝酸钾、纯碱”中选择适当物质的化学式填空:(1)人体重要的能量来源______; (2)可用作调味品和防腐剂______;(3)农业上可作复合肥料使用______;(4)其水溶液pH大于7______. 查看答案